this question carries 2 marks class 11 cbse, just answer the 7th question
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Sinoatrial node.It produces electric signals that determine rhythm of the heart
Explanation:
Sinoatrial node contains a group of cells in the wall of right atrium that continuously produce electric signals called action potentials that determine the rhythm of the heart.
The electric impulses stimulate contractions of the heart when it is working hence the name pacemaker.
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