Explain the rhythmicity of heart beat in mammals.

In mammals the sinus venosus is reduced to a patch of Purkinje fibers (also called sinoatrial node) in the wall of right atrium. This node acts as a pacemaker, initiating the wave of contraction i.e. rhythmic heart beat that spreads across the heart like in all other vertebrates. Another mass of typical muscle fibers called as the atrioventricular node in the waIl of ______ _______ ___ __________ __________ _________ ___ _________ __________ _______ _____.
_________ ___ ___ ______ ______ _______.
________ ___ _____ _________ ______ _______ _________ _________ ________.
___ ____ __________ __________ ___.
________ _______ _________ ___ _________ ___ __________ ________ __________ _____ _____.
_______ __________ ______ ________ ____.
______ ____ _____ __________ ___ ___ _____ __________ ________ ___ _______.
____ _____ ____ ____ _________ ________ ___ ______ ________.
______ ________ __________ _____ _____ _______ _________ ____ ____ ___ ____ ___.
________ _________ _________ _____ ____ _______ __________.
_____ _________ ______ __________ _________ ______ _______ ______ ____ ___ ______.
______ ____ ____ _______ _________ ____ ______ _____ ________ _______ __________ ______.
_________ _____ __________ _________ ____ ___ _______ ________ ________ ___ ________ __________.
________ ________ ____ ____ ________ _________ _____.
________ ______ ________ ____ ______ ______.
________ __________ _______ ____ _______ ____ ________ _________ ___.
_______ ______ _________ ________ ________ _______ ___ ___ ___ __________ ___ ____.
____ _____ ___ __________ ______ _______ ______.
____ ________ ____ _____ _____ __________ __________ _________ ___.
_______ ________ __________ _______ _______ _________.
_______ ______ _______ _____ _____ _________ ________ ______ ____ _________ _________ _________.
Get Full Answer on WhatsApp