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Nervous and Hormonal Control of Heart Rate
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Nervous and hormonal control of heart rate. OCR A: A level biology revision notes. Module 5: Communication, Homeostasis and Energy. A* biology student's notes. Summary of key content to be memorised. Process that needs to be memorised from specification.

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  • December 5, 2023
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  • 2023/2024
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Nervous & Hormonal Systems in Nervous & Hormonal Systems in
Controlling Heart Rate: Controlling Heart Rate:
Nervous Control:
Cardiac muscle is myogenic.
The SAN acts as a pacemaker & controls
heart rate when resting.
The medulla oblongata in the brain is
connected to the SAN by motor
neurones.
The nerves that connect the SAN & the
medulla oblongata are the vagus nerve
& the accelerans nerve.
The vagus nerve decreases heart rate.
The accelerans nerve increases heart
rate.
Stretch receptors in the muscles detect
movement of limbs & indicate that
more/less oxygen will be needed.
Baroreceptors in the aorta, vena cava &
carotid arteries detect changes in blood
pressure.
Chemoreceptors in the brain, aorta &
carotid arteries detect changes in pH
(from CO2) & indicate that more/less
oxygen is needed.
Hormonal Control:
Adrenaline binds to specific receptors in
cardiac muscle increasing the force &
rate of the heart beat.

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