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Question 20N.3.HL.TZ0.23c

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.HL.TZ0.23c
Level HL Paper 3 Time zone TZ0
Command term State Question number c Adapted from N/A
c.
[Maximum mark: 1]
20N.3.HL.TZ0.23c

The graph shows the Bohr shift.

[Source: From The New England Journal of Medicine, Connie C.W. Hsia, Respiratory Function of
Hemoglobin, Volume 338(4):239–47. Copyright © 1998, Massachusetts Medical Society. Reprinted with permission
from Massachusetts Medical Society.]

(c)

State the effect of carbon dioxide in blood on the rate of ventilation.

[1]

Markscheme

increased carbon dioxide in blood increases the rate of ventilation
OR
positive correlation/relationship;

Examiners report

Most candidates knew that CO2 affects the rate of ventilation, but some did not specify that an increase in CO2 caused an increase in ventilation rate, or vice versa.

Syllabus sections