★ The Cardiovascular System OCR A-level Quiz
What does the sympathetic nervous system do?
A. Increase heart rate
B. decrease heart rate
C. release hormones
D. absorb hormones
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cardiac muscles are myogenic – what does this mean?
A. muscles contract and relax by receiving signals from the nervous system
B. they have a particular genetic mutation
C. muscles contract and relax without receiving signals from the nervous system
D. the muscle cells wall are made of myelin
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