Two friends are eating together at a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of:

1.	diaphragm	2.	neck
3.	tongue	4.	epiglottis

What is true about RBCs in humans?

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

Haemoglobin is:

Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:

1. Inspiratory Reserve Volume

2. Tidal Volume

3. Expiratory Reserve Volume

4. Residual Volume

Alveoli are the primary sites of exchange of gases \(O_2\) ${\mathrm{}}_{}$and \(CO_2\) are exchanged in these sites by simple diffusion which is mainly based on

Mark the factors which are favourable for the formation of oxyhaemoglobin at the level of alveoli

i. High ${\mathrm{P}}_{{\mathrm{O}}_2}$

ii. Lesser ${\mathrm{H}}^{+}$ concentration

iii. Low ${\mathrm{P}}_{{\mathrm{CO}}_2}$

iv. Low temperature

1. (i), (ii) & (iv)

2. (i), (ii) & (iii)

3. (ii), (iii) & (iv)

4. (i), (ii), (iii) & (iv)

Which respiratory centre primarly limits inspiration?

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