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Question 18N.3.SL.TZ0.c

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.SL.TZ0.c
Level SL Paper 3 Time zone TZ0
Command term Suggest Question number c Adapted from N/A
c.
[Maximum mark: 1]
18N.3.SL.TZ0.c

The energy used by the brain and skeletal muscle of a 70 kg man was measured over the period of one day.

Suggest one reason for the difference between the brain and skeletal muscle in metabolic rate.

[1]

Markscheme

a. «brain requires more» energy to maintain a proper ionic balance/homeostasis/active transport ✔

b. «brain requires more» energy for synapses/neurotransmitters ✔

c. «brain requires more» energy for thinking and memory ✔

d. skeletal muscle active on demand but brain constantly active ✔

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