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Breathing and Exchange of Gases · Question 46

AIPMT 2006MCQEasy📈 Topic in 38% papers+4−1
1

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.

Answer

(3) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive

Solution

At high altitude the atmospheric pressure, and hence the partial pressure of O2, is low.

Less O2 binds to haemoglobin; the kidneys release erythropoietin, which stimulates the bone marrow to form more RBCs.

More RBCs (more haemoglobin) are needed to absorb the required amount of O2.

Answer: (3)

AIPMT 2006

Keep practising — Breathing and Exchange of Gases

2

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
3

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
4

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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