DP Biology (last assessment 2024)
Question 18M.3.HL.TZ1.21c
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.3.HL.TZ1.21c |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 3]
18M.3.HL.TZ1.21c
(c)
Hypertension has been suggested as a possible cause of CHD. Explain the possible causes of hypertension.
[3]
Markscheme
a. deposition of fat in arteries thus losing elasticity/forming fibrous tissues
b. deposition of fat/formation of plaque in arteries thus narrowing of lumen/causing a blockage
c. high salt levels in diets thus retaining more fluids
d. smoking because nicotine is a vasoconstrictor molecule
e. prolonged high levels of stress thus causing vasoconstriction / exposure to stress hormones
f. genetic predisposition makes it more likely that other factors will lead to hypertension
Do not accept a list.
