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Body Fluids and Circulation · Question 69

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
1

Impulse of heart beat originates from

  1. SA node
  2. AV node
  3. vagus nerve
  4. cardiac nerve

Answer

(1) SA node

Solution

As per NCERT, the SA node (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).

⇒ It initiates and maintains the rhythmic contractile activity of the heart.

∴ The SA node is the pacemaker; the impulse of heart beat originates from it.

Answer: (1)

AIPMT 2002

Keep practising — Body Fluids and Circulation

2

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
3

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
4

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
5

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
6

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
7

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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