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Topic 1: Anatomy

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Topic 1: Anatomy

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Directly related questions

20N.1.SL.tz0.2:
Which are functions of the axial skeleton?

I. To protect internal organs

II. To provide sites for attachment of muscle

III. To stabilize parts of appendicular skeleton

A. I and II only

B. I and III only

C. II and III only

D. I, II and III
20N.1.SL.tz0.1:
Which are parts of the pectoral girdle?

A. Ribs and clavicle

B. Clavicle and scapula

C. Scapula and humerus

D. Humerus and ribs
20N.1.SL.tz0.3: Which feature of the synovial joint covers the ends of the bones? A. Synovial membrane B....
20N.2.SL.tz0.2a: Identify the massaged muscle with the greatest stiffness post-run.
20N.2.SL.tz0.2b:
Calculate the difference in stiffness, in N m^–1, between massaged muscle and placebo post-massage for the muscle identified in 2(a).
20N.2.HL:.tz0.3c: Using an example, define the anatomical term posterior.
20N.2.HL:.tz0.7a:
Outline one type of muscle tissue.
20N.2.SL.tz0.6b:
Outline one type of muscle tissue.
20N.2.SL.tz0.2c: Deduce the effect of post-exercise massage on muscle stiffness at 72 hours post-massage.
20N.2.HL:.tz0.4a:
Outline the functions of the cranium and vertebral column during a contact sport such as boxing.
20N.2.SL.tz0.8d:
Outline five features of a synovial joint.
20N.2.HL:.tz0.3d: State the anatomical location of the iliopsoas.
21M.2.SL.tz0.6c: Describe the structural features of the hiker’s femurs.
21M.2.SL.tz0.6d: During the weeks of training prior to the journey, the hiker’s leg muscles increased in...
21M.1.SL.tz0.1: What are the functions of the axial skeleton?
21M.1.HL:.tz0.1: Which bones of the vertebral column are fused? A. Thoracic, sacral B. Lumbar, coccyx C....
21M.1.SL.tz0.2: Which statement is correct about the insertion of a skeletal muscle? A. The attachment of a...
21M.1.SL.tz0.3: The diagram shows the skeletal muscles in the anterior upper leg. Which muscle is labelled...
21N.1.SL.tz0.2: Which type of joint provides the greatest degree of movement? A. Fibrous B. Synovial C....
21N.1.SL.tz0.1:
What is the primary function of the skull and vertebral column?

A. Attachment

B. Movement

C. Support

D. Protection
21N.1.SL.tz0.3: Which defines the origin of a muscle? A. The attachment of a muscle tendon to a stationary...
21N.1.HL:.tz0.2: Which describes hypertrophy? A. A decrease in the size of a muscle fibre usually caused by a...
21N.2.SL.tz0.2a:
The diagram shows a long bone.

[Source: OpenStax College – Anatomy & Physiology, Connexions Web site. http://cnx.org/content/col11496/1.6/, Jun 19, 2013.
Attribution 3.0 Unported (CC BY 3.0) https://creativecommons.org/licenses/by/3.0/.]

Label structures A and B in the diagram.

A:

B:
21N.2.SL.tz0.2b.i:
State the location of the femur in relation to the tibia using anatomical terminology.
21N.2.SL.tz0.2b.ii: State the location of the sternum in relation to the vertebral column using anatomical terminology.
21N.2.SL.tz0.2c: Outline three functions of cartilage.
22M.1.SL.tz0.2: The diagram shows a gymnast performing a handstand. What is the position of the tarsals in...
22M.2.SL.tz0.3c:
The diagram shows skeletal muscle.

[Source: HENNING DALHOFF/SCIENCE PHOTO LIBRARY.]

Identify the parts labelled A and B.

A:

B:
22M.1.SL.tz0.1: Which bones form part of the appendicular skeleton? A. Sternum, clavicle, coccyx B. Skull,...
22M.1.SL.tz0.3: What is the function of a ligament? A. To attach muscle to bone B. To attach bone to bone C....
22M.2.SL.tz0.5a: Distinguish the characteristics of smooth and cardiac muscle.
22M.2.SL.tz0.4c: Outline three general features of muscle tissue.
22M.2.SL.tz0.2a: Identify the bone type of the scapula.
22M.2.HL:.tz0.12a: Distinguish the characteristics of smooth and cardiac muscle.
16N.2.SL.tz0.2b: State the type of synovial joint that is found at the distal end of the femur.
16N.2.SL.tz0.5a:
Outline the structural components of skeletal muscle.
16M.1.SL.tz0.1:
What type of joint is the ankle?

A. Saddle joint

B. Pivot joint

C. Hinge joint

D. Gliding joint
16M.1.SL.tz0.2: Which of the following bones has the movement of the body as its main function? A. Fibula B....
16M.1.SL.tz0.3: What is the main function of the knee joint ligament? A. To secrete synovial fluid B. To absorb...
17M.1.SL.tz0.1: Which bones form part of the appendicular skeleton? A. Femur, radius, ribs, patella B. Coccyx,...
16M.2.SL.tz0.5a:
Using examples of specific bones, outline the function of the axial skeleton.
17M.1.SL.tz0.4: Which muscles form the quadriceps femoris? A. Rectus femoris, vastus intermedialis, vastus...
16M.2.SL.tz0.3a: List two general characteristics common to muscle tissue.
17M.1.SL.tz0.3: What type of joint is found where the radius and carpals articulate? A. Hinge B. Ball and...
17M.2.SL.tz0.5a:
Distinguish between fibrous and cartilaginous joints.
17M.1.SL.tz0.2: Which joint is formed at the proximal head of the femur? A. Shoulder B. Elbow C. Hip D. Knee
17M.2.SL.tz0.6a:
Outline two characteristics common to muscle tissue.
17M.2.SL.tz0.4a:
Outline two types of connective tissue of joints.
16N.1.SL.tz0.1: What type of bones are the phalanges? A. Flat bones B. Long bones C. Short bones D. Irregular...
17N.1.SL.tz0.2: Which is the most lateral in the anatomical position? A. Sternum B. Ulna C. Radius D. Skull
16N.1.SL.tz0.3: Which muscle is on the anterior region of the body? A. Soleus B. Pectoralis C. Biceps...
17N.1.SL.tz0.3:
What is the structure labelled X on the sarcomere in the diagram below?

[Source: © International Baccalaureate Organization 2017]

A. Z line

B. Myofibril

C. Myosin filament

D. Actin filament
17N.2.SL.tz0.2a: Long bones are one type of bone found in the body. List two other types of bone. 1. 2.
16N.1.SL.tz0.2: What is the definition of the term insertion of a muscle? A. The attachment of a muscle tendon...
17N.1.SL.tz0.1: Which are types of synovial joints? A. Condyloid, saddle, gliding B. Immovable, slightly...
17N.2.SL.tz0.2b: Outline the function of a ligament in a shoulder joint.
17N.2.SL.tz0.5a:
Using examples, outline the function of the axial and appendicular skeleton during physical activity.
18N.1.SL.tz0.3:
What muscle is labelled X in the diagram below?

[Source: adapted from https://commons.wikimedia.org/wiki/File:Sartorius_3D.gif, BodyParts3D,
© The Database Center for Life Science licensed under CC Attribution-Share Alike 2.1 Japan.]

A. Iliopsoas

B. Sartorius

C. Vastus lateralis

D. Vastus intermedialis
18N.1.SL.tz0.2:
What structure is labelled X in the diagram below?

[Source: adapted from OpenStax, Anatomy & Physiology, 9.4 Synovial Joints, Figure 1, by Rice University,
Feb 26, 2016, https://cnx.org/contents/FPtK1zmh@12.7:bFtYymxt@7/Synovial-Joints. Licensed under a
Creative Commons Attribution 4.0 International License, https://creativecommons.org/licenses/by/4.0.]

A. Articular capsule

B. Synovial fluid

C. Articular cartilage

D. Synovial membrane
18N.2.HL:.tz0.3b.i:
Identify the origin and insertion for the rectus femoris.

[Source: Copyright 2003-2004 University of Washington, Seattle, Washington, U.S.A. All rights reserved including all
photographs and images. No re-use, re-distribution or commercial use without prior written permission of the authors and
the University of Washington. Musculoskeletal images are from the University of Washington ‘Musculoskeletal Atlas:
A Musculoskeletal Atlas of the Human Body” by Carol Teitz, M.D. and Dan Graney, Ph.D.]

Origin:

Insertion:
18N.1.HL:.tz0.1:
Which are components of the axial skeleton?

A. Ribs, Clavicle, Ilium

B. Skull, Vertebrae, Sternum

C. Ribs, Clavicle, Sternum

D. Skull, Vertebrae, Ilium
18N.2.HL:.tz0.3a: State the general characteristic common to muscle tissue that allows the muscle to stretch and...
18N.2.SL.tz0.2b: Describe the functions of ligaments and tendons in a joint such as the knee joint.
18N.2.SL.tz0.4a: Distinguish between the three different types of muscle.
18N.1.HL:.tz0.2: What is the position of the scapula relative to the rib cage? A. Medial B. Inferior C....
18N.2.HL:.tz0.3b.ii: Describe the functions of ligaments and tendons in a joint such as the knee joint.
18N.2.SL.tz0.2a:
State the general characteristic common to muscle tissue that allows the muscle to stretch and return to its original resting length.
19M.1.SL.tz0.1:
Which are the four types of bones?

A. Short, periosteum, long, regular

B. Long, short, irregular, flat

C. Compact, irregular, flat, long

D. Flat, short, compact, regular
19M.1.SL.tz0.2: An athlete’s broken leg is immobilized in a cast. Which muscle characteristic causes...
19M.2.HL:.tz0.3d.iii:
Using anatomical terminology, state the location of the patella relative to the tibia.
19M.1.SL.tz0.3: What is the muscle labelled X in the diagram? A. Abdominus rectus B. External...
19M.2.SL.tz0.3f.iii:
Using anatomical terminology, state the location of the patella relative to the tibia.
19M.2.SL.tz0.3f.ii:
Using anatomical terminology, state the location of the fibula relative to the tibia.
19M.2.SL.tz0.3f.i:
Using anatomical terminology, state the location of the tibia relative to the femur.
19M.2.SL.tz0.3b:
Define the term origin of a muscle.
19M.2.HL:.tz0.3d.i:
Using anatomical terminology, state the location of the tibia relative to the femur.
19M.2.HL:.tz0.3b:
Define the term origin of a muscle.
19M.2.HL:.tz0.3d.ii:
Using anatomical terminology, state the location of the fibula relative to the tibia.
19N.1.SL.tz0.3: Which types of muscles are only under involuntary control? I. Smooth muscle II. Cardiac...
19N.2.HL:.tz0.3a.i: State the names of the muscles at X and Y. X: Y:
19N.2.SL.tz0.7d:
Outline the characteristics of muscle.
19N.2.SL.tz0.3b:
The articular capsule, meniscus and ligaments provide stability at the knee. Outline two other features of a synovial joint.
19N.1.SL.tz0.2: Using anatomical terminology, what is the position of the sacral bones relative to the lumbar...
19N.2.HL:.tz0.3b.i:
The diagram shows a skeletal muscle.

[Source: adapted from sportsinjuryclinic.net]

Identify the structures X and Y in the diagram.

X:

Y:
19N.2.SL.tz0.3a: Distinguish the movement permitted between a fibrous and a cartilaginous joint.
19N.2.HL:.tz0.7a.i: Using anatomical terminology, state the location of the cerebellum in relation to the cerebrum.
19N.1.SL.tz0.1:
The diagram below shows a long bone. What is the structure labelled X?

[Source: reprinted from The Lancet, Diabetes & Endocrinology, Vol. 2, no 5, M.G. Vervloet et al., Bone: a new endocrine
organ at the heart of chronic kidney disease and mineral and bone disorders, Pages 427–436, Copyright 2014,
with permission from Elsevier. https://www.thelancet.com/journals/landia/home ]

A. Compact bone

B. Spongy bone

C. Diaphysis

D. Cartilage
19N.1.HL:.tz0.2:
The diagram shows a sarcomere. What are the structures labelled X?

[Source: used with permission of Wiley & Sons – Books, adapted from Principles of anatomy and physiology,
by Tortora, Gerard J., Grabowski, Sandra Reynolds, 2003, permission conveyed through Copyright Clearance Center, Inc.]

A. Myofibril

B. Endomysium

C. Actin

D. Myosin

Sub sections and their related questions

1.1. The skeletal system

16M.1.SL.tz0.1:
What type of joint is the ankle?

A. Saddle joint

B. Pivot joint

C. Hinge joint

D. Gliding joint
16M.1.SL.tz0.2: Which of the following bones has the movement of the body as its main function? A. Fibula B....
16M.1.SL.tz0.3: What is the main function of the knee joint ligament? A. To secrete synovial fluid B. To absorb...
17M.1.SL.tz0.1: Which bones form part of the appendicular skeleton? A. Femur, radius, ribs, patella B. Coccyx,...
17M.1.SL.tz0.2: Which joint is formed at the proximal head of the femur? A. Shoulder B. Elbow C. Hip D. Knee
17M.1.SL.tz0.3: What type of joint is found where the radius and carpals articulate? A. Hinge B. Ball and...
16M.2.SL.tz0.5a:
Using examples of specific bones, outline the function of the axial skeleton.
17M.2.SL.tz0.4a:
Outline two types of connective tissue of joints.
17M.2.SL.tz0.5a:
Distinguish between fibrous and cartilaginous joints.
16N.1.SL.tz0.1: What type of bones are the phalanges? A. Flat bones B. Long bones C. Short bones D. Irregular...
17N.1.SL.tz0.1: Which are types of synovial joints? A. Condyloid, saddle, gliding B. Immovable, slightly...
17N.1.SL.tz0.2: Which is the most lateral in the anatomical position? A. Sternum B. Ulna C. Radius D. Skull
18N.1.SL.tz0.2:
What structure is labelled X in the diagram below?

[Source: adapted from OpenStax, Anatomy & Physiology, 9.4 Synovial Joints, Figure 1, by Rice University,
Feb 26, 2016, https://cnx.org/contents/FPtK1zmh@12.7:bFtYymxt@7/Synovial-Joints. Licensed under a
Creative Commons Attribution 4.0 International License, https://creativecommons.org/licenses/by/4.0.]

A. Articular capsule

B. Synovial fluid

C. Articular cartilage

D. Synovial membrane
19M.1.SL.tz0.1:
Which are the four types of bones?

A. Short, periosteum, long, regular

B. Long, short, irregular, flat

C. Compact, irregular, flat, long

D. Flat, short, compact, regular
19M.2.SL.tz0.3f.i:
Using anatomical terminology, state the location of the tibia relative to the femur.
19M.2.SL.tz0.3f.ii:
Using anatomical terminology, state the location of the fibula relative to the tibia.
19M.2.SL.tz0.3f.iii:
Using anatomical terminology, state the location of the patella relative to the tibia.
19M.2.HL:.tz0.3d.i:
Using anatomical terminology, state the location of the tibia relative to the femur.
19M.2.HL:.tz0.3d.ii:
Using anatomical terminology, state the location of the fibula relative to the tibia.
19M.2.HL:.tz0.3d.iii:
Using anatomical terminology, state the location of the patella relative to the tibia.
18N.1.HL:.tz0.1:
Which are components of the axial skeleton?

A. Ribs, Clavicle, Ilium

B. Skull, Vertebrae, Sternum

C. Ribs, Clavicle, Sternum

D. Skull, Vertebrae, Ilium
18N.1.HL:.tz0.2: What is the position of the scapula relative to the rib cage? A. Medial B. Inferior C....
16N.2.SL.tz0.2b: State the type of synovial joint that is found at the distal end of the femur.
17N.2.SL.tz0.2a: Long bones are one type of bone found in the body. List two other types of bone. 1. 2.
17N.2.SL.tz0.2b: Outline the function of a ligament in a shoulder joint.
17N.2.SL.tz0.5a:
Using examples, outline the function of the axial and appendicular skeleton during physical activity.
18N.2.SL.tz0.2b: Describe the functions of ligaments and tendons in a joint such as the knee joint.
18N.2.HL:.tz0.3b.i:
Identify the origin and insertion for the rectus femoris.

[Source: Copyright 2003-2004 University of Washington, Seattle, Washington, U.S.A. All rights reserved including all
photographs and images. No re-use, re-distribution or commercial use without prior written permission of the authors and
the University of Washington. Musculoskeletal images are from the University of Washington ‘Musculoskeletal Atlas:
A Musculoskeletal Atlas of the Human Body” by Carol Teitz, M.D. and Dan Graney, Ph.D.]

Origin:

Insertion:
18N.2.HL:.tz0.3b.ii: Describe the functions of ligaments and tendons in a joint such as the knee joint.
19N.1.SL.tz0.1:
The diagram below shows a long bone. What is the structure labelled X?

[Source: reprinted from The Lancet, Diabetes & Endocrinology, Vol. 2, no 5, M.G. Vervloet et al., Bone: a new endocrine
organ at the heart of chronic kidney disease and mineral and bone disorders, Pages 427–436, Copyright 2014,
with permission from Elsevier. https://www.thelancet.com/journals/landia/home ]

A. Compact bone

B. Spongy bone

C. Diaphysis

D. Cartilage
19N.1.SL.tz0.2: Using anatomical terminology, what is the position of the sacral bones relative to the lumbar...
19N.1.SL.tz0.3: Which types of muscles are only under involuntary control? I. Smooth muscle II. Cardiac...
19N.2.SL.tz0.3a: Distinguish the movement permitted between a fibrous and a cartilaginous joint.
19N.2.SL.tz0.3b:
The articular capsule, meniscus and ligaments provide stability at the knee. Outline two other features of a synovial joint.
19N.2.HL:.tz0.7a.i: Using anatomical terminology, state the location of the cerebellum in relation to the cerebrum.
20N.1.SL.tz0.1:
Which are parts of the pectoral girdle?

A. Ribs and clavicle

B. Clavicle and scapula

C. Scapula and humerus

D. Humerus and ribs
20N.1.SL.tz0.2:
Which are functions of the axial skeleton?

I. To protect internal organs

II. To provide sites for attachment of muscle

III. To stabilize parts of appendicular skeleton

A. I and II only

B. I and III only

C. II and III only

D. I, II and III
20N.1.SL.tz0.3: Which feature of the synovial joint covers the ends of the bones? A. Synovial membrane B....
20N.2.SL.tz0.8d:
Outline five features of a synovial joint.
20N.2.HL:.tz0.3c: Using an example, define the anatomical term posterior.
20N.2.HL:.tz0.3d: State the anatomical location of the iliopsoas.
20N.2.HL:.tz0.4a:
Outline the functions of the cranium and vertebral column during a contact sport such as boxing.
21M.2.SL.tz0.6c: Describe the structural features of the hiker’s femurs.
21M.1.SL.tz0.1: What are the functions of the axial skeleton?
21M.1.SL.tz0.2: Which statement is correct about the insertion of a skeletal muscle? A. The attachment of a...
21M.1.HL:.tz0.1: Which bones of the vertebral column are fused? A. Thoracic, sacral B. Lumbar, coccyx C....
21N.1.SL.tz0.1:
What is the primary function of the skull and vertebral column?

A. Attachment

B. Movement

C. Support

D. Protection
21N.1.SL.tz0.2: Which type of joint provides the greatest degree of movement? A. Fibrous B. Synovial C....
21N.2.SL.tz0.2a:
The diagram shows a long bone.

[Source: OpenStax College – Anatomy & Physiology, Connexions Web site. http://cnx.org/content/col11496/1.6/, Jun 19, 2013.
Attribution 3.0 Unported (CC BY 3.0) https://creativecommons.org/licenses/by/3.0/.]

Label structures A and B in the diagram.

A:

B:
21N.2.SL.tz0.2b.i:
State the location of the femur in relation to the tibia using anatomical terminology.
21N.2.SL.tz0.2b.ii: State the location of the sternum in relation to the vertebral column using anatomical terminology.
21N.2.SL.tz0.2c: Outline three functions of cartilage.
22M.1.SL.tz0.1: Which bones form part of the appendicular skeleton? A. Sternum, clavicle, coccyx B. Skull,...
22M.1.SL.tz0.2: The diagram shows a gymnast performing a handstand. What is the position of the tarsals in...
22M.1.SL.tz0.3: What is the function of a ligament? A. To attach muscle to bone B. To attach bone to bone C....
22M.2.SL.tz0.2a: Identify the bone type of the scapula.

1.2. The muscular system

17M.1.SL.tz0.4: Which muscles form the quadriceps femoris? A. Rectus femoris, vastus intermedialis, vastus...
16M.2.SL.tz0.3a: List two general characteristics common to muscle tissue.
17M.2.SL.tz0.6a:
Outline two characteristics common to muscle tissue.
16N.1.SL.tz0.2: What is the definition of the term insertion of a muscle? A. The attachment of a muscle tendon...
16N.1.SL.tz0.3: Which muscle is on the anterior region of the body? A. Soleus B. Pectoralis C. Biceps...
17N.1.SL.tz0.3:
What is the structure labelled X on the sarcomere in the diagram below?

[Source: © International Baccalaureate Organization 2017]

A. Z line

B. Myofibril

C. Myosin filament

D. Actin filament
18N.1.SL.tz0.3:
What muscle is labelled X in the diagram below?

[Source: adapted from https://commons.wikimedia.org/wiki/File:Sartorius_3D.gif, BodyParts3D,
© The Database Center for Life Science licensed under CC Attribution-Share Alike 2.1 Japan.]

A. Iliopsoas

B. Sartorius

C. Vastus lateralis

D. Vastus intermedialis
19M.1.SL.tz0.2: An athlete’s broken leg is immobilized in a cast. Which muscle characteristic causes...
19M.1.SL.tz0.3: What is the muscle labelled X in the diagram? A. Abdominus rectus B. External...
19M.2.SL.tz0.3b:
Define the term origin of a muscle.
19M.2.HL:.tz0.3b:
Define the term origin of a muscle.
16N.2.SL.tz0.5a:
Outline the structural components of skeletal muscle.
18N.2.SL.tz0.2a:
State the general characteristic common to muscle tissue that allows the muscle to stretch and return to its original resting length.
18N.2.SL.tz0.4a: Distinguish between the three different types of muscle.
18N.2.HL:.tz0.3a: State the general characteristic common to muscle tissue that allows the muscle to stretch and...
18N.2.HL:.tz0.3b.i:
Identify the origin and insertion for the rectus femoris.

[Source: Copyright 2003-2004 University of Washington, Seattle, Washington, U.S.A. All rights reserved including all
photographs and images. No re-use, re-distribution or commercial use without prior written permission of the authors and
the University of Washington. Musculoskeletal images are from the University of Washington ‘Musculoskeletal Atlas:
A Musculoskeletal Atlas of the Human Body” by Carol Teitz, M.D. and Dan Graney, Ph.D.]

Origin:

Insertion:
19N.2.SL.tz0.7d:
Outline the characteristics of muscle.
19N.2.HL:.tz0.3a.i: State the names of the muscles at X and Y. X: Y:
19N.2.HL:.tz0.3b.i:
The diagram shows a skeletal muscle.

[Source: adapted from sportsinjuryclinic.net]

Identify the structures X and Y in the diagram.

X:

Y:
19N.1.HL:.tz0.2:
The diagram shows a sarcomere. What are the structures labelled X?

[Source: used with permission of Wiley & Sons – Books, adapted from Principles of anatomy and physiology,
by Tortora, Gerard J., Grabowski, Sandra Reynolds, 2003, permission conveyed through Copyright Clearance Center, Inc.]

A. Myofibril

B. Endomysium

C. Actin

D. Myosin
20N.2.SL.tz0.2a: Identify the massaged muscle with the greatest stiffness post-run.
20N.2.SL.tz0.2b:
Calculate the difference in stiffness, in N m^–1, between massaged muscle and placebo post-massage for the muscle identified in 2(a).
20N.2.SL.tz0.2c: Deduce the effect of post-exercise massage on muscle stiffness at 72 hours post-massage.
20N.2.SL.tz0.6b:
Outline one type of muscle tissue.
20N.2.HL:.tz0.3d: State the anatomical location of the iliopsoas.
20N.2.HL:.tz0.7a:
Outline one type of muscle tissue.
21M.2.SL.tz0.6d: During the weeks of training prior to the journey, the hiker’s leg muscles increased in...
21M.1.SL.tz0.2: Which statement is correct about the insertion of a skeletal muscle? A. The attachment of a...
21M.1.SL.tz0.3: The diagram shows the skeletal muscles in the anterior upper leg. Which muscle is labelled...
21N.1.SL.tz0.3: Which defines the origin of a muscle? A. The attachment of a muscle tendon to a stationary...
21N.1.HL:.tz0.2: Which describes hypertrophy? A. A decrease in the size of a muscle fibre usually caused by a...
22M.2.SL.tz0.3c:
The diagram shows skeletal muscle.

[Source: HENNING DALHOFF/SCIENCE PHOTO LIBRARY.]

Identify the parts labelled A and B.

A:

B:
22M.2.SL.tz0.4c: Outline three general features of muscle tissue.
22M.2.SL.tz0.5a: Distinguish the characteristics of smooth and cardiac muscle.
22M.2.HL:.tz0.12a: Distinguish the characteristics of smooth and cardiac muscle.