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Body Fluids and Circulation · Question 66

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of

  1. atrioventricular bundle
  2. Purkinje system
  3. sino-atrial node
  4. atrioventricular node.

Answer

(3) sino-atrial node

Solution

As per NCERT, the SAN (sino-atrial node), present in the right upper corner of the right atrium, can generate the maximum number of action potentials (70–75 per minute) and is therefore called the pacemaker.

⇒ When the natural pacemaker fails, the artificial pacemaker must take over the function of the SAN.

∴ It will be grafted at the site of the sino-atrial node.

Answer: (3)

AIPMT 2003

Keep practising — Body Fluids and Circulation

2

Bundle of His is a network of

  1. muscle fibres distributed throughout the heart walls
  2. muscle fibres found only in the ventricle wall
  3. nerve fibres distributed in ventricles
  4. nerve fibres found throughout the heart.
AIPMT 2003
3

In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be

  1. B
  2. O
  3. AB
  4. A.
AIPMT 2003
4

Impulse of heart beat originates from

  1. SA node
  2. AV node
  3. vagus nerve
  4. cardiac nerve
AIPMT 2002
5

Which of the following statements is true for lymph?

  1. WBC + serum
  2. Blood - RBCs and some proteins
  3. RBCs + WBCs + plasma
  4. RBCs + proteins + platelets
AIPMT 2002
6

Continuous bleeding from an injured part of body is due to deficiency of

  1. vitamin A
  2. vitamin B
  3. vitamin K
  4. vitamin E.
Out of syllabusAIPMT 2002
7

What is correct for blood group O?

  1. No antigens but both a and b antibodies are present
  2. A antigen and b antibody present
  3. Antigen and antibody both absent
  4. A and B antigens and a, b antibodies present
AIPMT 2001
8

Difference between pulmonary artery and pulmonary vein is that, the pulmonary artery has

  1. no endothelium
  2. valves
  3. thicker walls
  4. oxygenated blood
AIPMT 2000
9

In which point, pulmonary artery is different from pulmonary vein?

  1. Its lumen is broad
  2. Its wall is thick
  3. It has valves
  4. It does not possess endothelium
AIPMT 2000
10

Which statement is true for WBC?

  1. Non-nucleated
  2. In deficiency, cancer is caused
  3. Manufactured in thymus
  4. Can squeeze through blood capillaries
AIPMT 2000

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