Human Biology
Human Biology
16th Edition
ISBN: 9781260482799
Author: Mader, Sylvia
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 5.3, Problem 2CYP
Summary Introduction

To explain:

The reason behind the production of ‘lub’ and ‘dub’ sounds by the heart.

Introduction:

The heart undergoes repeated contraction and relaxation of the auricles and ventricles, which is known as the heartbeats. The simultaneous contractions of atria and ventricles are known as systole, and the synchronized relaxation or resting phase of the chambers is known as the diastole. An average human heart beats seventy to seventy-two times per minute.

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