Gaseous exchange

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 –

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

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

Pneumotaxic centre is present in –

• Pons

• Medulla oblongata

• Cerebrum

• Cerebellum

The breathing centre initiates ventilation in response to –

• A decrease in air pressure

• A decrease in O₂

• An increase in CO₂

• The rate of gas exchange in the alveoli