Breathing and exchange of gases

CO₂ is transported –

• By RBC

• As bicarbonates

• In a dissolved state through plasma

• All

All of the following favour the dissociation of oxyhaemoglobin to deliver O₂ to tissues except –

• PO2 = $\uparrow$

• PCO2 = $\uparrow$ or H+ = $\uparrow$

• Temperature = $\uparrow$

• PO2 = $\updownarrow$

The graph shows an oxygen dissociation curve for haemoglobin –

Where in the body will haemoglobin be saturated at the percentages shown at points 1, 2, and 3 on the graph?

• Left ventricle 1 Pulmonary vein 2 Vena cava 3

• Left ventricle 2 Pulmonary vein 1 Vena cava 3

• Left ventricle 2 Pulmonary vein 3 Vena cava 1

• Left ventricle 3 Pulmonary vein 2 Vena cava 1

Every 100 ml of oxygenated blood delivers following amount of O₂ to the tissues under normal physiological condition

• 5 ml

• 25 ml

• 50 ml

• More the 50 ml

A person has vital capacity of 5L and residual volume of 1.2 L. Total lung capacity –

• 6.2 L

• 4.8 L

• 500 ml

• None

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

• Inspiratory Reserve Volume

• Tidal Volume

• Expiratory Reserve Volume

• Residual Volume

A person suffer’s punctures in his chest cavity in an accident, without any damage to the lungs. its effect could be

• Reduced breathing rate

• Rapid increase in breathing rate

• No change in respiration

• Cessation of breathing

The partial pressure of oxygen and the partial pressure of carbon dioxide is identical in

• Alveoli and deoxygenated blood

• Tissues and deoxygenated blood

• Oxygenated blood and tissues

• Tissues and oxygenated blood

The maximum volume of air a person can breathe in after a forced expiration is known as :

• Total Lung Capacity

• Expiratory Capacity

• Vital Capacity

• Inspiratory Capacity

The form of energy used in respiration is :

• Chemical

• Electrical

• Mechanical

• Radiant