Date | May 2018 | Marks available | 2 | Reference code | 18M.3.SL.TZ1.4 |
Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
Command term | Identify | Question number | 4 | Adapted from | N/A |
Question
The image shows a normal human brain in vertical section.
Identify the parts of the brain labelled X and Y.
Outline the function of the nucleus accumbens.
Compare and contrast the sensory and motor functions of the left and right cerebral hemispheres of the brain.
Markscheme
X = cerebellum
Y = pituitary gland
perception of pleasure / control of depression / reward centre / secretes dopamine
Compare:
a. both parts control higher order functions / example of higher order function
b. each side controls muscle contraction on other side of body / example
c. each side receives sensory input from sense organs from other side of body / example
Contrast:
d. right CH controls muscles on left side but left CH controls right side
e. right CH receives sensory input from left side of body but left CH receives from right side
f. Broca’s / Wernicke’s / speech processing in left CH only
g. left CH receives sensory input from RHS of visual field in both eyes but vice versa for right CH
At least one compare and one contrast needed for 3 marks.