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Question 18N.3.HL.TZ0.1d

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.HL.TZ0.1d
Level HL Paper 3 Time zone TZ0
Command term Outline Question number d Adapted from N/A
d.
[Maximum mark: 2]
18N.3.HL.TZ0.1d

Measurements of the lung capacity of a student were recorded using a spirometer and displayed with a data logger. Initially the student was at rest, then changed to carrying out strenuous exercise. The results are displayed in the graph.

(d)

Outline the function of pneumocytes in the lungs.

[2]

Markscheme

a. type I pneumocytes carry out gas exchange ✔ 
OWTTE

b. type II pneumocytes secrete surfactant/fluid OWTTE
OR
type II pneumocytes create a moist surface inside the alveoli
OR
type II pneumocytes reduce surface tension between alveoli
OR
type II pneumocytes prevent the sides of the alveolus adhering to each other ✔

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