CBSE Class 10 Answered
5 marks question :
Q27. (¡) What is blood clotting ? Why is it known to be a useful mechanism ?
(¡¡) What is meant by Heartbeat and what is the usual Heartbeat at rest ?
Asked by pdcavita | 11 Feb, 2018, 11:39: AM
Expert Answer
(i) The mechanism of the blood to stop flow excessively during a cut or an injury. It is a useful mechanism because it helps in maintaining the quantum of blood balance so that minimum amount of blood is lost from our body, as, loss of blood in larger amount might sometimes lead to death.
(ii) Complete of one pulse i.e a cycle of systole and diastole is called as heartbeat. A normal resting heart rate for adults ranges from 60 to 100 beats per minute whereas in child it ranges from 70 to 100 beats per minute.
Answered by Sivanand Patnaik | 11 Feb, 2018, 05:32: PM
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