Cardiac muscles are .....

Which animal has the largest heart?

$SAN$ generates an action potential which stimulates both the $A$ to undergo a simultaneous contraction called $B$. This increases the flow of the blood into the ventricles by about $C$ percentage. Choose the correct option for $A, B$ and $C$.

Which of the following statements about the human heart is correct?

Purkinje fibres are present in

The amount of blood supplied to the brain per minute is: