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Question 18M.1.HL.TZ1.21

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.1.HL.TZ1.21
Level HL Paper 1 Time zone TZ1
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
18M.1.HL.TZ1.21

When intense physical activity is anticipated, which factor in the blood will increase the frequency of sinoatrial signals to heart muscle?

A. pH

B. Oxygen level

C. Thyroxin

D. Epinephrine

[1]

Markscheme

D

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