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Breathing and Exchange of Gases · Question 41

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

Which two of the following changes (i – iv) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)? (i) Increase in red blood cell size (ii) Increase in red blood cell production (iii) Increased breathing rate (iv) Increase in thrombocyte count Changes occurring are

  1. (ii) and (iii)
  2. (iii) and (iv)
  3. (i) and (iv)
  4. (i) and (ii)

Answer

(1) (ii) and (iii)

Solution

At high altitude the partial pressure of O2 in air is low, so less oxygen reaches the tissues.

⇒ To take in more O2, the breathing rate increases (iii).

⇒ The kidneys release more erythropoietin, which increases RBC production in the bone marrow (ii), raising the oxygen-carrying capacity of blood.

⇒ The size of RBCs and the count of thrombocytes (platelets) do not change for this purpose.

∴ Changes (ii) and (iii) occur.

Answer: (1)

AIPMT 2010 (Prelims)

Keep practising — Breathing and Exchange of Gases

2

What is vital capacity of our lungs?

  1. Inspiratory reserve volume plus expiratory reserve volume
  2. Total lung capacity minus residual volume
  3. Inspiratory reserve volume plus tidal volume
  4. Total lung capacity minus expiratory reserve volume
AIPMT 2009
3

The haemoglobin of a human foetus

  1. has only 2 protein subunits instead of 4
  2. has a higher affinity for oxygen than that of an adult
  3. has a lower affinity for oxygen than that of the adult
  4. its affinity for oxygen is the same as that of an adult.
AIPMT 2009
4

The majority of carbon dioxide produced by our body cells is transported to the lungs as

  1. attached to haemoglobin
  2. dissolved in the blood
  3. bicarbonates
  4. carbonates.
AIPMT 2006
5

Which one of the following statements is incorrect?

  1. The principle of countercurrent flow facilitates efficient respiration in gills of fishes.
  2. The residual air in lungs slightly decreases the efficiency of respiration in mammals.
  3. The presence of non-respiratory air sacs increases the efficiency of respiration in birds.
  4. In insects, circulating body fluids serve to distribute oxygen to tissues.
AIPMT 2006
6

People living at sea level have around 5 million RBC per cubic millimetre of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude

  1. people eat more nutritive food, therefore more RBCs are formed
  2. people get pollution-free air to breathe and more oxygen is available
  3. atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
  4. there is more UV radiation which enhances RBC production.
AIPMT 2006
7

Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing unusually high content of

  1. carbon disulphide
  2. chloroform
  3. carbon dioxide
  4. carbon monoxide.
AIPMT 2004
8

When CO2 concentration in blood increases breathing becomes

  1. shallower and slow
  2. there is no effect on breathing
  3. slow and deep
  4. faster and deeper
AIPMT 2004
9

Given below are four matchings of an animal and its kind of respiratory organ: The correct matchings are

  1. (A) and (B)
  2. (A), (B) and (C)
  3. (B) and (D)
  4. (C) and (D).
AIPMT 2003

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