Which of the following animals has a myogenic heart?

What is the connection between the pulmonary artery and the aorta in a fetus called?

In the given diagram of the vertical section of the human heart,which label represents the papillary muscles?

The $SA$ node is located in

Following are the stages of the pathway for the conduction of an action potential through the heart:
$A.$ $AV$ bundle
$B.$ Purkinje fibres
$C.$ $AV$ node
$D.$ Bundle branches
$E.$ $SA$ node
Choose the correct sequence of the pathway from the options given below:

Describe the internal structure of the human heart in detail.