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Respiratory System MCQ - Multiple Choice Question and Answer

Respiratory System MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 1
Air directly enters the tracheae via the

external nares
pharynx
larynx
bronchi

Question No : 2
The rate and depth of breathing is primarily controlled by medulla by

the oxygen content of the blood
the nitrogen content of the blood
receptors in the larynx
the carbon dioxide content of the bkxxl

Question No : 3
The opening into the wind pipe or trachea is called

larynx
epiglottis
glottis
bronchi

Question No : 4
The "mountain sickness" in persons climbing to high attitudes without the aid of oxygen cylinders is due to

lack of sufficient amount of haemoglobin
lack of sufficient amount of erythrocytes
arterial hypoxia
anaemic hypoxia

Question No : 5
The iron containing haemoglobin pigment is a

protein
polysaccharide
enzyme
none of these

Question No : 6
The process of breathing-in of oxygen rich air from outside is called

expiration
inspiration
respiration
oxidation

Question No : 7
Ciliated epithelium in the trachea of mammals helps in

sucking-in air
pushing expired air out
pushing mucus out
keeping the alveolar air in circulation