The diagram represents part of the autonomic nervous system which links the brain to the heart - Scottish Highers Human Biology - Question 5 - 2018
Question 5
The diagram represents part of the autonomic nervous system which links the brain to the heart.
(a) Name the parts of the brain and heart which are linked by the ne... show full transcript
Worked Solution & Example Answer:The diagram represents part of the autonomic nervous system which links the brain to the heart - Scottish Highers Human Biology - Question 5 - 2018
Step 1
Name the parts of the brain and heart which are linked by the nerves shown in the diagram.
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Explain how the sympathetic and parasympathetic nerves control heart rate.
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Answer
The sympathetic nervous system increases the heart rate by releasing norepinephrine, while the parasympathetic nervous system decreases it by releasing acetylcholine.
Step 3
Use the diagram to calculate the individual’s heart rate.
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Answer
60 beats/min
Step 4
Describe what happens in the heart between points Q and S.
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Answer
The ventricles are contracting and pumping blood (ventricular systole). Alternatively, impulses are spreading through the ventricles.
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