Pneumotaxic centre is located in:

1. Pons

2. Cerebrum

3. Medulla oblongata

4. Thalamus

Read the following steps and arrange them in correct sequence for the process of inspiration:

A. Increases thoracic volume

B. Air moves into lungs

C. The contraction in diaphragm and EICM

D. Increases pulmonary volume

E. Lungs expand

F. Decreases the pulmonary pressure (IPP)

1. A, B, C, D, E, F

2. C, D, A, E, F, B

3. C, A, E, D, F, B

4. C, E, D, A, F, B

By the contraction in radial muscle of diaphragm it become flattened in shape, so, volume of thoracic cavity increases in :-

1. Anterior-posterior axis

2. Dorsal-ventral axis

3. Anterior-lateral axis

4. Dorsal-lateral axis

Every 2000 mL of deoxygenated blood delivers approximately, how much mL CO${}_2$ to alveoli?

1. 4 mL

2. 4.2 mL

3. 8 mL

4. 80 mL

The amount of air that enters the lungs during normal, restful breathing is called the______.

1. Vital capacity

2. Tidal volume

3. Total lung capacity

4. Expiratory reserve volume 

'Chemosensitive Area' for regulation of respiration is present on ?

1. Medulla

2. Pons

3. Cerebrum

4. Cerebellum

Why the partial pressure of ${\mathrm{CO}}_2$ is high at tissue-site?

1. Due to the saturation of ${\mathrm{O}}_2$ with Hb

2. Release of ${\mathrm{H}}^{+}$ at the tissue site

3. Due to metabolism

4. Due to the dissociation of ${\mathrm{HbO}}_2$

The partial pressure of ${\mathrm{O}}_2$ and ${\mathrm{CO}}_2$ in the arterial blood respectively is

1. 40 mmHg and 45 mmHg

2. 100 mmHg and 45 mmHg

3. 95 mmHg and 40 mmHg

4. 45 mmHg and 40 mmHg

The partial pressure of carbon dioxide in the pulmonary artery is

1. More than that in tissues

2. Equal to that in systemic arteries

3. Less than that in alveoli

4. Equal to that in the systemic vein 

Emphysema is a chronic disorder, it leads to
(1) Loss of elasticity of walls of bronchioles and
alveoli

(2) Surface area of exchange of gases is
increased

(3) Alveolar sacs become empty even after
expiration

(4) Exhalation becomes easier during inflation of
lungs