NCERT Breathing Exchange Gases model,sample,mock tests,mcqs NEET

Breathing and Exchange of Gases Mock Test-3

Question No:1

Even when air being absent, human trachea does not collapse due to the presence of

[A] bony rings
[B] turgid pressure
[C] chitinous rings
[D] cartilaginous rings



Question No:2

The chambers formed dorsally by the vertebral column, ventrally by sternum, laterally by ribs and on the lower side by dome-shaped diaphragm is

[A] abdominal chamber
[B] cranial chamber
[C] pelvic chamber
[D] thoracic chamber



Question No:3

Select the incorrect statement from the following:

[A] Pleural fluid reduces friction on the lung surface
[B] The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity. Such an arrangement is essential for breathing, as we cannot directly alter the pulmonary volume
[C] The tracheae, primary, secondary and tertiary bronchi, and initial bronchioles are supported by complete cartilaginous rings.
[D] During swallowing glottis can be covered by a thin elastic cartilaginous flap called epiglottis to prevent the entry of food into the larynx.



Question No:4

During inspiration

[A] Diaphragm and external intercostals muscle relax
[B] Diaphragm and internal intercostals muscles relax
[C] Diaphragm and external intercostals muscles contract
[D] Diaphragm and internal intercostals muscles contract



Question No:5

During inspiration, the diaphragm

[A] relaxes to become dome-shaped
[B] contracts and flattens
[C] expands
[D] shows no change



Question No:6

Expiration involves

[A] Relaxation of diaphragm and intercostals muscles
[B] Contraction of diaphragm and intercostals muscles
[C] Contraction of diaphragm muscles
[D] Contraction of intercostals muscles



Question No:7

Which two of the following changes (a – d) usually tend to occur in plain dwellers when they move to higher altitudes (3500 m or more)
(i) Increase in red blood cell size
(ii) Increase in red blood cell production
(iii) Increase in breathing rate
(iv) Increase in thrombocyte count

[A] both (iii) and (iv)
[B] both (i) and (iv)
[C] both (iii) and (i)
[D] both (ii) and (iii)



Question No:8

In alveolar air, partial pressure of CO2 is:

[A] 40mmHg
[B] 44mmHg
[C] 46 mm Hg
[D] 42 mm Hg



Question No:9

Arrange the following steps of respiration properly:
1) Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO2 rich alveolar air is released out
2) Diffusion of gases (O2 and CO2) across alveolar membrane
3) Transport of gases by the blood
4) Diffusion of O2 and CO2 between blood and tissues
5) Utilization of O2, by the cells for catabolic reactions and resultant release of CO2

[A] 1,2,3,4,5
[B] 1,3,2,5,4
[C] 5,4,3,1,2
[D] 3,4,5,2,1



Question No:10

Expiratory muscles contract at the tune of

[A] Deep inspiration
[B] Normal inspiration and expiration
[C] Forceful expiration
[D] Muscular expansion of lungs



Question No:11

Which of the following statements is correct?

[A] Inspiration is an active process
[B] Inspiration is a passive process
[C] Expiration is an active process
[D] Both expiration and inspiration are passive processes



Question No:12

Gaseous exchange between blood and alveolar air across respiratory membrane occurs by:

[A] osmosis
[B] diffusion
[C] active transport
[D] phagocytosis



Question No:13

On an average, a healthy human breathes how many times/minute

[A] 20-40
[B] 72-75
[C] 3-5
[D] 12-16



Question No:14

We can increase the strength of inspiration and expiration by the help of additional muscle in

[A] Abdomen
[B] Neck
[C] Pelvis
[D] Head



Question No:15

Match the following:
1) Tidal volume – A. Tidal volume and inspiratory reserve volume and expiratory reserve volume
2) Inspiratory reserve volume – B. Additional volume of air a person can inspire by a forcible inspiration
3) Expiratory reserve volume – C. Volume of air remaining in the lungs even after a forcible expiration
4) Residual volume – D. Tidal volume and inspiratory reserve volume
5) Inspiratory reserve capacity – E. Volume of air inspirited or expired during a normal respiration
6) Vital capacity – F. Vital capacity + residual volume
7) Total lung capacity -G. Additional volume of air a person can expire by a forcible expiration

[A] 1-E, 2-C, 3-B, 4-G, 5-D, 6-A, 7-F
[B] 1-E, 2-G, 3-B, 4-C, 5-A, 6-D, 7-F
[C] 1-E, 2-C, 3-3,4-B, 5-D, 6-A, 7-F
[D] 1-E, 2-B, 3-G, 4-C, 5-D, 6-A, 7-F