Body Fluids and Circulation Questions — NEET Biology

Q1

Arteries carry oxygenated blood except

A Pulmonary

B Cardiac

C Hepatic

D Systemic

Correct Answer

Option A

Solution

(a) Pulmonary artery carries deoxygenated blood from the right ventricle to the lungs.

Q2

A specialised nodal tissue embedded in the lower corner of the right atrium delays spreading of impulses to heart apex for about 0.1 sec. This delay allows

A the atria to empty completely.

B blood to enter aorta.

C the ventricles to empty completely.

D blood to enter pulmonary arteries.

Correct Answer

Option A

Solution

(a) The delay provided by AVN prevents simultaneous contraction of ventricles and auricles, allowing atria to empty completely.

Q3

All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

A SA node has the highest rate of depolarisation.

B SA node has the lowest rate of depolarisation.

C SA node is the only component to generate the threshold potential.

D Only SA node can convey the action potential to the other components.

Correct Answer

Option A

Solution

(a) SA node acts as pace-maker because its autoexcitable tissue generates heart impulses at the highest rate.

Q4

The QRS complex in a standard ECG represents

A Depolarisation of auricles

B Depolarisation of ventricles

C Repolarisation of ventricles

D Repolarisation of auricles

Correct Answer

Option B

Solution

(b) The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction.

Q5

Match fibrinogen, globulin and albumin with their functions

A & (iii) & (ii) & (i) \

B & (i) & (ii) & (iii) \

C & (ii) & (iii) & (i) \

D & (i) & (iii) & (ii) array

Correct Answer

Option C

Solution

(c) Fibrinogen forms fibrin strands during coagulation. Globulins for defence mechanism. Albumin for osmotic balance.

Q6

Which one of the following human organs is often called the graveyard of RBCs?

A Gall bladder

B Kidney

C Spleen

D Liver

Correct Answer

Option C

Solution

(c) Spleen is called graveyard of RBC because old and dead RBCs are constantly removed from the blood by it.

Q7

Which one of the following plasma proteins is involved in the coagulation of blood?

A an albumin

B serum amylase

C a globulin

D fibrinogen

Correct Answer

Option D

Solution

(d) Fibrinogen is converted to insoluble protein fibrin during the clotting process.

Q8

The figure shows a human blood cell - Basophil. Identify characteristics.

A Monocyte Life span 3 days, produce cytokines

B Basophil Secrete histamine, inflammatory response

C B-lymphocyte Form about 20% of white blood cells involved in immune response

D Neutrophil Most abundant blood cell, phagocytic

Correct Answer

Option B

Solution

(b) Basophils secrete histamine, serotonin, heparin, etc., and are involved in inflammatory reactions.

Q9

Person with blood group AB is considered as universal recipient because he has:

A both A and B antigens on RBC but no antibodies in the plasma.

B both A and B antibodies in the plasma.

C no antigen on RBC and no antibody in the plasma.

D both A and B antigens in the plasma but no antibodies.

Correct Answer

Option A

Solution

(a) AB blood group individuals have both antigen A and antigen B on their RBCs, and no antibodies for either.

Q10

Erythropoiesis starts in :

A Liver

B Spleen

C Red bone marrow

D Kidney

Correct Answer

Option C

Solution

(c) Red bone marrow from 6 months onwards becomes the principal site of erythropoiesis.