Nerve impulses from ANS and hormones like epinephrine
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a
can modify the rate of heart beat but not the cardiac output
b
establish the fundamental rhythm of the heart
c
can modify the rate and strength of the heartbeat
d
are not concerned with the functioning of heart as SAN sets the pace
answer is C.
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Detailed Solution
Nerve impulses from the autonomic nervous system (ANS) and blood-borne hormones (such as epinephrine) modify the timing and strength of each heartbeat, but they do not establish the fundamental rhythm.