Breathing and Exchange of Gases — Page 4 | NEET Biology

Q31

Select the correct statement.

A Expiration is initiated due to contraction of diaphragm.

B Expiration occurs due to external intercostal muscles.

C Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

D Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.

Correct Answer

Option C

Solution

(c) During inspiration, intrapulmonary pressure decreases to less than atmospheric pressure.

Q32

What is vital capacity of the lungs?

A Inspiratory reserve volume plus tidal volume

B Total lung capacity minus expiratory reserve volume

C Inspiratory reserve volume plus expiratory reserve volume

D Total lung capacity minus residual volume

Correct Answer

Option D

Solution

(d) Vital capacity = TRV + TV + ERV = Total lung capacity minus residual volume.

Q33

Intercostal muscles occur in

A abdomen

B thigh

C ribs

D diaphragm

Correct Answer

Option C

Solution

(c) Intercostal muscles are attached with the ribs which help in movement of rib cage during breathing.

Q34

The alveolar epithelium in the lungs is

A nonciliated columnar

B nonciliated squamous

C ciliated columnar

D ciliated squamous

Correct Answer

Option B

Solution

(b) The alveolar wall is composed of moist, non-ciliated, squamous epithelial cells.

Q35

Skin is an accessory organ of respiration in

A humans

B frog

C rabbit

D lizard

Correct Answer

Option B

Solution

(b) Frog respires through skin during hibernation and when in water.

Q36

Carbonic anhydrase occurs in

A Lymphocytes

B Blood plasma

C RBC

D Leucocytes

Correct Answer

Option C

Solution

(c) Carbonic anhydrase is a zinc-containing enzyme present in RBCs.

Q37

Air is breathed through

A Trachea - lungs - larynx - pharynx - alveoli

B Nose - larynx - pharynx - bronchus - alveoli - bronchioles

C Nostrils - pharynx - larynx - trachea - bronchi - bronchioles - alveoli

D Nose - mouth - lungs

Correct Answer

Option C

Solution

(c) Pathway: Nostrils - pharynx - larynx - trachea - bronchi - bronchioles - alveoli.

Q38

The quantity 1500 ml in the respiratory volumes of a normal human adult refers to

A maximum air that can be inspired and expired

B residual volume

C expiratory reserve volume

D total lung capacity

Correct Answer

Option B

Solution

(b) Residual volume is the volume of air that remains inside lungs at the end of maximum forceful expiration.

Q39

The majority of carbon dioxide produced by our body cells is transported to the lungs

A as bicarbonates

B as carbonates

C attached to hemoglobin

D dissolved in the blood

Correct Answer

Option A

Solution

(a) 70% of CO2 is transported as bicarbonate ions.

Q40

Select the correct events that occur during inspiration.

A (iii) and (iv)

B (i), (ii) and (iv)

C Only (iv)

D (i) and (ii)

Correct Answer

Option D

Solution

(d) Inspiration: contraction of diaphragm and contraction of external inter-coastal muscles.