Adrenal medullary hormones can
AConvert myocardium into smooth muscle
BDecrease heart rate and stroke volume
CIncrease cardiac output and heart rate
DStop the SAN action potential firing
Answer & Solution
Correct answer: C. Increase cardiac output and heart rate
Adrenaline and noradrenaline from the adrenal medulla raise heart rate and stroke volume, increasing cardiac output. Sympathetic ANS works in parallel; parasympathetic ANS does the opposite.
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