a) What is meant by 'heartbeat'? What is the usual heartbeat rate at rest? (b) What change occurs in heartbeats if a person runs for a while? Why?
BiologyClass 10ICSEAnswered 27 Mar 2026
Answer
(a) Heartbeat is the sound produced when there is contraction and relaxation of the heart. At rest, the human heart usually beats 70 to 72 times per minute.
(b) A person's heart beats faster after running for a while or when a person is strained physically. After, the physical strain the person needs more oxygen. Hence the heart pumps faster.
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