A-Level Biology Specification

Edexcel B 9BI0

Section 9.8: Control of heart rate in mammals

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#9.8i

Understand how the autonomic nervous system controls heart rate including:

- aortic and carotid baroreceptors and chemoreceptors
- cardiac centre in the medulla oblongata
- sympathetic nerve stimulated to release noradrenaline at the SAN
- parasympathetic nerve stimulated to release acetylcholine at the SAN.

#9.8ii

Understand the role of the autonomic nervous system in causing the release of adrenaline to increase heart rate.