Which vertebrate organ receives only oxygenated blood?

  • A
    Gill
  • B
    Lung
  • C
    Spleen
  • D
    Liver

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Select the correct option:
$(1)$ The pericardium is a double-layered membrane surrounding the heart.
$(2)$ The $SA$ node has a higher rate of impulse generation compared to the $AV$ node.

Purkinje fibers are located in the following structure/s:

$A$ : The first phase of ventricular filling is rapid and causes the $3^{rd}$ heart sound.
$R$ : It is because of auricular systole.

The mitral valve is supported by which of the following structures?

What is the significance of the time gap in the passage of the action potential from the sino-atrial node to the ventricle?

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