The blood bank of the body or the reservoir where blood is stored and can be mobilized is:

Analogy type questions:
$(1)$ Fish : Single circulation :: Amphibians : ...........
$(2)$ Between right atrium and right ventricle : Tricuspid valve :: Between left atrium and left ventricle : .............

Select the correct option for myogenic and neurogenic hearts.

Newborn babies generally do not shiver despite low temperatures because of:

Oedema is defined as:

$A$: In an open circulatory system,the volume of blood is high,but blood pressure is low and irregular.
$R$: In a closed circulatory system,the volume of blood is limited,and blood pressure is high and regular.