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Breathing and Exchange of Gases · Question 47

AIPMT 2004MCQEasy📈 Topic in 38% papers+4−1
1

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.

Answer

(4) carbon monoxide.

Solution

Carboxyhaemoglobin (COHb) is formed when carbon monoxide combines with the haem of haemoglobin.

Hb + CO HbCO (carboxyhaemoglobin)

∵ The affinity of haemoglobin for CO is about 200 times its affinity for O2, inhaling air rich in CO raises the carboxyhaemoglobin level and reduces oxygen transport.

∵ CO2 combines with the amino groups of globin to form carbamino-haemoglobin, not carboxyhaemoglobin.

∴ The patient has been inhaling air with an unusually high content of carbon monoxide.

Answer: (4)

AIPMT 2004

Keep practising — Breathing and Exchange of Gases

2

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
3

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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