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Question 19N.2.HL.TZ0.c

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.2.HL.TZ0.c
Level HL Paper 2 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
19N.2.HL.TZ0.c

Explain how calcium is involved in muscle contraction.

[3]

Markscheme

a. action potential/nerve impulse causes release of calcium ✔

b. from sarcoplasmic reticulum/specialized endoplasmic reticulum ✔

c. binds to troponin ✔

d. causes tropomyosin to move/be removed «from binding sites» ✔

e. exposes myosin-binding sites on actin/allows myosin «heads» to bind to actin ✔

Syllabus sections