Question

Read the following statements carefully.
$\left(1\right)$ In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart
$\left(2\right)$ The openings of the right and the left ventricles into the pulmonary artery and the aorta respectively are provided with the mitral valves.
$\left(3\right)$ The nodal musculature has the ability to generate action potential without any external stimuli, i.e., it is auto-excitable
$\left(4\right)$ The T-wave of ECG represents depolarization of the ventricles
Which of the given two statements are correct?

• A. $1$ and $3$
• B. $2$ & $4$
• C. $1$ and $2$
• D. $3$ & $4$

Answer 1

The correct option is A $1$ and $3$

The correction in statements (2) and (4) are:

• In vertebrates, the mitral valves are present between the left atrium and the left ventricle.
• The T wave of ECG represents repolarization of the ventricles, not depolarization.

So, the correct answer is '1 and 3'.