Free Body Fluids And Circulation (Daily Quiz: 8) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Adult human RBCs are enucleated. Which of the following statements (s) is/are most appropriate explanation for this feature?

1. They do not need to reproduce
2. They are somatic cells
3. They do not metabolize
4. All their internal space is available for oxygen transport

(a) only (a)

(b) (b) and (c)

(c) (a), (c) and (d)

(d) only (d)

Question-2

A vein possesses a large lumen because

(a) tunica media and tunica externa form a single coat

(b) tunica interna, tunica media and tunica externa are thin

(c) tunica interna and tunica media form a single coat

(d) tunica media is a thin coat.

Question-3

Mammals are said to have double circulation. It means

(a) There are two types of blood vessels attached to every organ.

(b) Blood vessels are paired.

(c) There are two systems, one from the heart to the lungs and back to the rest of the body.

(d) Blood circulates twice through the heart.

Question-4

Assertion :
SAN is called the pacemaker of heart.
Reason :
The SAN can generate the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractile activity of the heart.

(a) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

(b) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

(c) If Assertion is true but Reason is false.

(d) If both Assertion and Reason are false.

Question-5

QRST is related with

(a) Ventricular contraction or depolarization

(b) Auricular relaxation

(c) Auricular contraction

(d) Cardiac cycle