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Body Fluids and Circulation · Question 53

AIPMT 2010 (Prelims)MCQMedium📈 Topic in 25% papers+4−1
1

If due to some injury the chordae tendineae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?

  1. The flow of blood into the aorta will be slowed down
  2. The 'pacemaker' will stop working
  3. The blood will tend to flow back into the left atrium
  4. The flow of blood into the pulmonary artery will be reduced

Answer

(4) The flow of blood into the pulmonary artery will be reduced

Solution

As per NCERT, the tricuspid valve guards the opening between the right atrium and the right ventricle; chordae tendineae hold its cusps and prevent them from turning back into the atrium when the ventricle contracts.

⇒ If the chordae tendineae are partially non-functional, during ventricular systole some blood of the right ventricle leaks back into the right atrium.

⇒ Less blood is then pumped from the right ventricle into the pulmonary artery.

∴ The flow of blood into the pulmonary artery will be reduced. (The left atrium and aorta belong to the left side; the pacemaker, SAN, is not affected.)

Answer: (4)

AIPMT 2010 (Prelims)

Keep practising — Body Fluids and Circulation

2

There is no DNA in

  1. mature RBCs
  2. a mature spermatozoan
  3. hair root
  4. an enucleated ovum.
AIPMT 2009
3

In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?

  1. S - start of systole
  2. T - end of diastole
  3. P - depolarisation of the atria
  4. R - repolarisation of ventricles
AIPMT 2009
4

Globulins contained in human blood plasma are primarily involved in

  1. osmotic balance of body fluids
  2. oxygen transport in the blood
  3. clotting of blood
  4. defence mechanisms of body.
AIPMT 2009
5

Compared to blood our lymph has

  1. plasma without proteins
  2. more WBCs and no RBCs
  3. more RBCs and less WBCs
  4. no plasma.
AIPMT 2009
6

In humans, blood passes from the post caval to the diastolic right atrium of heart due to

  1. stimulation of the sino auricular node
  2. pressure difference between the post caval and atrium
  3. pushing open of the venous valves
  4. suction pull
AIPMT 2008
7

The most active phagocytic white blood cells are

  1. eosinophils and lymphocytes
  2. neutrophils and monocytes
  3. neutrophils and eosinophils
  4. lymphocytes and macrophages
AIPMT 2008
8

Which type of white blood cells are connected with the release of histamine and the natural anticoagulant heparin?

  1. Eosinophils
  2. Monocytes
  3. Neutrophils
  4. Basophils
AIPMT 2008
9

A drop of each of the following, is placed separately on four slides. Which of them will not coagulate?

  1. Blood serum
  2. Sample from the thoracic duct of lymphatic system
  3. Whole blood from pulmonary vein
  4. Blood plasma
AIPMT 2007
10

If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?

  1. Serum albumins
  2. Fibrinogen in the plasma
  3. Serum globulins
  4. Haemocytes
AIPMT 2007
11

Examination of blood of a person suspected of having anaemia shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following is likely to alleviate his symptoms?

  1. Iron compounds
  2. Thiamine
  3. Folic acid and cobalamin
  4. Riboflavin
Out of syllabusAIPMT 2006

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