Select the correct option for myogenic and neurogenic hearts.

What is the study of the circulatory system called?

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

Which of the following is correct regarding blood coagulation?
$I$. Vitamin-$K$ is necessary for the formation of prothrombin.
$II$. Conversion of fibrinogen to fibrin is done by thrombin.
$III$. Conversion of prothrombin to thrombin is done by the enzyme complex prothrombinase.
The option with the correct combination is:

Which of the following is an incorrect combination?

Which one of the following is a matching pair of a certain body feature and its value/count in a normal human adult?