CBSE Class 7 Answered
Discuss how a heartbeat is formed?
Asked by Topperlearning User | 04 Jun, 2014, 13:23: PM
Expert Answer
The walls of the chambers of the heart are made up of muscles. These muscles contract and relax rhythmically. This rhythmic contraction followed by its relaxation constitutes a heartbeat.
Answered by | 04 Jun, 2014, 15:23: PM
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