Respiratory System MCQ Question with Answer

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

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