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Question 17N.2.HL.TZ0.01e.i

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.2.HL.TZ0.01e.i
Level HL Paper 2 Time zone TZ0
Command term Outline Question number e.i Adapted from N/A
e.i.
[Maximum mark: 1]
17N.2.HL.TZ0.01e.i

Skeletal muscle contractions can take two different forms: if they are stimulated by a single action potential they take the form of a twitch and if they are stimulated by a series of action potentials the contraction is longer lasting (tetanic). The table shows the effects of hypoxia on the force of twitch and peak tetanic contraction in the diaphragm.

[Source: Reproduced with permission of the © ERS 2011. European Respiratory Journal June 2011, 37 (6) 1474–1481; DOI: 10.1183/09031936.00079810]

(e.i)

Outline the effect of hypoxia on the force of contraction of the diaphragm.

[1]

Markscheme

reduces «force of» twitch AND peak tetanic contraction

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