EVERYDAY SCIENCE

Detailed explanation-1: -It is located in the right atrium. The SA node has the inherent power of generating a wave of contraction and controlling the heartbeat. Hence, it is known as the pacemaker. Since the heartbeat is initiated by the SA node and the impulse of contraction originates in the heart itself, the human heart is termed myogenic.

Detailed explanation-2: -The impulse of contraction of the heart begins in the heart itself, as a result, the mammalian heart is called myogenic. It doesn’t need any external stimulus for contraction.

Detailed explanation-3: -(1) The heart shows autorhythmicity because the impulse for its rhythmic movement develops inside the heart. Such heart is called myogenic. (2) Some of the cardiac muscle fibres become autorhythmic (self-excitable) and start generating impulses during development.

Detailed explanation-4: -The human heart is an example of myogenic heart, it possesses cardiac muscle helping the heart to automatically contract spontaneously; which do not need any stimuli as in neurogenic heart. A myogenic heart is capable of generating a cardiac contraction independent of nervous input.

Detailed explanation-5: -A heart that does not require neural input to beat is called a myogenic heart. Human heart is myogenic and it consists of a modified muscular tissue that initiates the electrochemical impulse. The sino atrial node is the modified muscular tissue present in the right atrium.