Question

Choose the correct option.
(i) Human heart is ectodermal in origin.
(ii) Mitral valve guards the opening between right atrium and left ventricle.
(iii) SAN is located on the left upper corner of right atrium.
(iv) Stroke volume $\times$ Heart rate = Cardiac output.

• A. i alone is correct
• B. i and ii alone are correct
• C. ii and iii alone are correct
• D. iv alone is correct
• E. ii and iv alone are correct

Answer 1

Answer: (D)

iv alone is correct

(i) Human heart is mesodermal in origin as it develops from the middle germ layer mesoderm.

(ii) Mitral valve or bicuspid valve guards the opening between left atrium and left ventricle.

(iii) SAN (Sinoatrial node) is located on the right upper corner of right atrium.

(iv) Cardiac output is the amount of blood pumped by left ventricle into aorta and is calculated as a product of stroke volume and heart rate i.e. cardiac output = stroke volume x heart rate.

Hence, only statement iv is correct.

So, the correct answer is 'iv alone is correct'.