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 heart rate by releasing norepinephrine, which stimulates the heart to beat faster.
The parasympathetic system decreases heart rate by releasing acetylcholine, which slows down the heart rate.
Step 3
Use the diagram to calculate the individual’s heart rate.
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Answer
The heart rate is 60 beats/min.
Step 4
Describe what happens in the heart between points Q and S.
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Answer
During this period, the ventricles are contracting, pumping blood during the ventricular systole. This phase shows that impulses are spreading through the ventricles.
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