Question 19N.3.HL.TZ0.4d
| Date | November 2019 | Marks available | [Maximum mark: 3] | Reference code | 19N.3.HL.TZ0.4d |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | d | Adapted from | N/A |
The figures below show a human and a sheep brain.
[Source: Pearson Scott Foresman, donated to the Wikimedia Foundation,
https://commons.wikimedia.org/wiki/File:Convolution_he_-_sheep_and_human_brain.png]
Explain the need for the adult human brain to be supplied continuously with a relatively large supply of blood.
[3]
a. the brain contains a very large number of neurons and therefore consumes large amount of energy ✔ OWTTE
b. «large» requirement for oxygen/glucose to provide energy for «aerobic» cell respiration ✔
c. energy used to sustain the electric charges of neurons
OR
energy used to sustain the membrane potential of neurons
OR
energy used to produce neurotransmitters ✔
d. brain has continuous activity that requires continuous supply of oxygen/glucose ✔ OWTTE
