Question

Which of the following statement (s) regarding the cardiac system is/are correct?
(i) Human heart is an ectodermal derivative.
(ii) Mitral valve guards the opening between the right atrium and left ventricle.
(iii)SAN is located on the left upper corner of the right atrium.
(iv)$\text{Stroke volume}\times \text{Heart rate}=\text{Cardiac output}$

• A. (i) and (ii)
• B. (iv) only
• C. (i) only
• D. (ii) and (iii)

Answer 1

The correct option is B (iv) only

Human heart is both ectodermal and mesodermal in origin.
The mitral valve lies between the left atrium and the left ventricle of the heart.
The sinoatrial node, or SA node is a small mass of specialized tissue located in the right upper chamber (atria) of the heart.
Cardiac output is logically equal to the product of the stroke volume and the number of beats per minute (heart rate).

So, only (iv) statement is correct, therefore the correct answer is- option d.