Question
Biology Question on Mechanism Of Breathing
Rate of heart beat is determined by
A
Purkinje fibres
B
papillary muscles
C
AV-node
D
SA-node.
Answer
SA-node.
Explanation
Solution
SA nodes can act as the normal pacemaker and is used to determine the rate of heartbeat. It helps in the regulation of the heartbeat with the help of the action potential that is generated. n depolarization heart muscles contract and therefore pumping of the blood. SA nodes have the highest depolarization rate because their cells have the ability to automaticity. As the pacemaker cells create these rhythmical impulse therefore an artificial pacemaker is implanted at the site of SA node to mimic the actions of the node and conducting system and helps to regulate heartbeat.