The volume of 'anatomical dead space’ air is normally

(1) 230 mL

(2) 210 mL

(3) 190 mL

(4) 150 mL.

Subtopic:  Respiratory System: Pulmonary Volumes & Capacities |
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Oxyhaemoglobin dissociates into oxygen and deoxyhaemoglobin at

1. low O2, pressure in tissue

2. high O2, pressure in tissue

3. equal O2, pressure inside and outside tissue

4. all times irrespective of O2, pressure

Subtopic:  Respiratory System: Transport of Gases |
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A person sitting at rest experiences a temporary cessation of breathing after forced deep breathing for a few minutes.This is due to:-

(1) too much CO2 in the blood

(2) too much O2 in the blood

(3) very little CO2 in the blood

(4) both high O2 and very little CO2 in the blood

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
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Epidermis is specialized for :-
(1) respiration

(2) absorption

(3) protection

(4) All of these

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In the blood of an adult man the total content of haemoglobin is roughly

(1) several hundred grams

(2) tens of gram (10-100 g)

(3) several grams

(4) several hundred milligram

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases |
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The haemoglobin content per 100 ml of blood of a normal healthy human adult is:

(1) 5 - 11 g

(2) 25 - 30 g

(3) 17 - 20 g

(4) 12 - 16 g

Subtopic:  Respiratory System: Exchange of Gases |
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Assertion             :       Coughing and sneezing are necessary.

Reason                :      Coughing and sneezing are reflex actions.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Respiratory System: Pulmonary Ventilation |
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Assertion   :       Most fish when out of water, die of suffocation.

Reason      :       Atmospheric air contains far less oxygen content than the dissolved oxygen in water.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Respiratory System: Upper Respiratory Tract |
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Assertion       :       During inspiration, pressure of air falls in the thorax.

Reason          :       There is a rise in volume of thorax during inspiration.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion      :       During inspiration, the volume of thorax increases.

Reason         :       This happens due to the relaxation of diaphragm and inspiratory muscles.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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