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Question 19N.3.SL.TZ0.5b

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.SL.TZ0.5b
Level SL Paper 3 Time zone TZ0
Command term Suggest Question number b Adapted from N/A
b.
[Maximum mark: 1]
19N.3.SL.TZ0.5b

The MRI brain scans show the cerebral hemispheres of two people of the same age, one of whom is suffering from multiple sclerosis and has lost motor functions.

[Source: © Frontiers in Bioscience. Role of MRI in Multiple Sclerosis II: Brain and Spinal
Cord Atrophy, Robert Zivadinov and Rohit Bakshi, 9, 647–664, January 1, 2004]

(b)

Suggest one way in which multiple sclerosis has affected the cerebral hemispheres of the brain.

[1]

Markscheme

less white matter
OR
bigger space in the middle/ventricles
OR
overall area/volume of cortex/cerebrum is reduced/space between cortex/cerebrum and cranium bigger/number of folds is reduced
OR
slower nerve transmission
OR
fewer synapses
OR
function of cerebral hemispheres diminished ✔

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