← Biology (0610)
Q1 / 5
Breathing
Higher
2 marks
How is the breathing rate controlled when blood CO2 levels rise?
A
Chemoreceptors in the brain detect rising CO2/falling pH and increase breathing rate
B
Receptors in the lungs detect CO2 and directly speed up muscle contractions
C
The heart rate increases, which speeds up breathing automatically
D
Rising CO2 causes the diaphragm to contract spontaneously
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Breathing — Biology (0610) | Smartzi