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Date	May 2021	Marks available	1	Reference code	21M.1.SL.tz0.7
Level	Standard Level	Paper	Paper 1	Time zone	time zone 0
Command term		Question number	7	Adapted from	N/A

Question

What is the primary role of platelets?

A. Supporting immune function

B. Carrying dissolved substances

C. Transporting oxygen

D. Blood clotting and preventing bleeding

Markscheme

D

Examiners report

Common higher level question. 5th easiest question (87.20 % correctly answered).

Syllabus sections

Topic 2: Exercise physiology » 2.2. Structure and function of the cardiovascular system » 2.2.2. Distinguish between the functions of erythrocytes, leucocytes and platelets.

18N.1.HL:.tz0.6:
Which is the function of platelets?

A. Clot blood

B. Deliver oxygen

C. Produce antibodies

D. Carry carbon dioxide
19M.1.SL.tz0.6:
How does an increased erythrocyte level benefit an athlete?

A. By increasing the oxygen carrying capacity of the blood

B. By decreasing the capacity of the blood to clot in case of an injury

C. By increasing the ability of the body to fight infection

D. By decreasing viscosity of the blood
19M.2.SL.tz0.2a:
State one component transported by blood.
16M.2.SL.tz0.7b:
Outline the functions of two components of blood.
17M.2.SL.tz0.4b:
Describe the functions of erythrocytes, platelets and leucocytes.
22M.1.HL:.tz0.5: What is the function of leucocytes? A. To assist in clotting the blood. B. To transport...
20N.2.SL.tz0.4a: State the function of platelets in response to a skin cut.
20N.2.HL:.tz0.4c: State the function of platelets in response to a skin cut.

Topic 2: Exercise physiology » 2.2. Structure and function of the cardiovascular system

Topic 2: Exercise physiology