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Question 18N.2.SL.TZ0.4c

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.SL.TZ0.4c
Level SL Paper 2 Time zone TZ0
Command term Describe Question number c Adapted from N/A
c.
[Maximum mark: 2]
18N.2.SL.TZ0.4c
(c)

The heart responds quickly to physical activity. Describe how heart rate is controlled to meet the increased circulatory demands.

[2]

Markscheme

a. nerve impulse from medulla/brain acts on heart/right atrium ✔

b. pacemaker/sinoatrial node/SAN increases/controls contraction of heart ✔

c. epinephrine/adrenaline «rapidly» increases heart rate ✔

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