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Question 19M.2.SL.TZ1.4a

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ1.4a
Level SL Paper 2 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
19M.2.SL.TZ1.4a

The diagram shows the structure of an alveolus and an adjacent capillary.

[Source: © International Baccalaureate Organization 2019]

(a)

Outline the functions of type I and type II pneumocytes.

[2]

Markscheme

type I:

a. carry out gas exchange
OR
diffusion of gases/CO2/O2 ✔

type II:

b. secrete fluid/surfactant ✔

Examiners report

Weak knowledge of pneumocytes from many candidates and whilst many showed an understanding of gas exchange they failed to articulate it properly using the correct phrasing and terminology.

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