Question
Sino-Atrial node (SAN) can generate impulses(a) $70-75 \mathrm{~min}^{-1}$(b) $50-55 \mathrm{~min}^{-1}$(c) $35-40 \mathrm{~min}^{-1}$(d) $90-100 \mathrm{~min}^{-1}$
Step 1
It is responsible for the determination of the heartbeat. The electrical activity generated by the SAN spreads through the walls of the atria and causes them to contract, forcing blood into the ventricles. The SAN sets the rate and rhythm of the heartbeat and is Show more…
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SA node is called the pace maker of the heart. Why? (a) It can change contractile activity generated by AV node. (b) It delays the transmission of impulse between the atria and ventricles. (c) It gets stimulated when it receives neural signal. (d) It initiates and maintains the rhythmic contractile activity of heart.
The sinoatrial (SA) node (a) initiates diastole (b) conducts impulses directly to the muscle fibers of both ventricles (c) briefly delays transmission before the action potential continues into the ventricles (d) transmits action potentials directly into the atrial muscle fibers (e) consists of smooth muscle fibers
If the frequency of human heart is $1.25 \mathrm{~Hz}$, the number of heart beats in 1 minute is (a) 65 (b) 75 (c) 80 (d) 90
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