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Body Fluids and Circulation · Question 14

NEET (UG) 2022MCQEasy📈 Topic in 38% papers+4−1
1

Which one of the following statements is correct?

  1. The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction
  2. The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria
  3. Blood moves freely from atrium to the ventricle during joint diastole.
  4. Increased ventricular pressure causes closing of the semilunar valves.

Answer

(3) Blood moves freely from atrium to the ventricle during joint diastole.

Solution

As per NCERT, when all four chambers are in a relaxed state (joint diastole), the tricuspid and bicuspid valves are open and blood from the pulmonary veins and vena cava flows through the atria into the ventricles.

(1) is wrong: the SA node, not the AVN, generates the action potential that stimulates atrial contraction.

(2) is wrong: the AV valves are already open during joint diastole; atrial systole only increases the flow of blood into the ventricles by about 30 per cent.

(4) is wrong: increased ventricular pressure closes the AV valves and opens the semilunar valves; the semilunar valves close when ventricular pressure falls during ventricular diastole.

Answer: (3)

NEET (UG) 2022

Keep practising — Body Fluids and Circulation

2

A unique vascular connection between the digestive tract and liver is called.

  1. Hepato-cystic system
  2. Hepato-pancreatic system
  3. Hepatic portal system
  4. Renal portal system
NEET (UG) 2022 (Phase 2)
3

Arrange the following formed elements in the decreasing order of their abundance in blood in humans: Choose the most appropriate answer from the options given below:

  1. A, C, B, D, E
  2. C, A, B, E, D
  3. C, B, A, E, D
  4. D, E, B, A, C
NEET (UG) 2022 (Phase 2)
4

Persons with 'AB' blood group are called as "Universal recipients". This is due to :

  1. Absence of antibodies, anti-A and anti-B, in plasma
  2. Absence of antigens A and B on the surface of RBCs
  3. Absence of antigens A and B in plasma
  4. Presence of antibodies, anti-A and anti-B, on RBCs
NEET (UG) 2021
5

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

  1. Thrombokinase
  2. Thrombin
  3. Renin
  4. Epinephrine
NEET (UG) 2021
6

Match the following columns and select the correct option.

  1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
  3. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  4. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
NEET (UG) 2020
7

The QRS complex in a standard ECG represents

  1. Repolarisation of ventricles
  2. Repolarisation of auricles
  3. Depolarisation of auricles
  4. Depolarisation of ventricles
NEET (UG) 2020
8

Match the Column-I with Column-II : Select the correct option.

  1. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
  2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(v)
  3. (a)-(ii), (b)-(i), (c)-(v), (d)-(iii)
  4. (a)-(ii), (b)-(iii), (c)-(v), (d)-(iv)
NEET (UG) 2019
9

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

  1. 100 beats per minute
  2. 125 beats per minute
  3. 50 beats per minute
  4. 75 beats per minute
NEET (UG) 2019
10

Match the items given in column I with those in column II and select the correct option given below.

  1. (a)-(i), (b)-(ii), (c)-(iii)
  2. (a)-(iii), (b)-(i), (c)-(ii)
  3. (a)-(i), (b)-(iii), (c)-(ii)
  4. (a)-(ii), (b)-(i), (c)-(iii)
NEET 2018
11

Match the items given in column I with those in column II and select the correct option given below.

  1. (a)-(i), (b)-(iii), (c)-(ii)
  2. (a)-(iii), (b)-(ii), (c)-(i)
  3. (a)-(ii), (b)-(iii), (c)-(i)
  4. (a)-(i), (b)-(ii), (c)-(iii)
NEET 2018

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