Given below are two statements with reference to measurement of blood pressure.

Statement I - The appearance of Korotkoff sounds for the first time due to release of external pressure indicates diastolic pressure. Statement II - The disappearance of Korotkoff sounds for the first time due to release of external pressure indicates systolic pressure.

In the light of above statements, select the correct option given below:

How many electrodes are generally positioned on chest during recording of ECG?

If Rh antigens are introduced into the body of $\mathrm{Rh}^{-\mathrm{ve}}$ person for second time, then it leads to _________

Given below are two statements.

Statement I - Wall of the left ventricle is more muscular and about three times thicker than that of the right ventricle.

Statement II - Columnae carneae are present in the wall of atria as well as ventricles.

In the light of above statements, select the correct option given below: