CO₂ is transported through blood to lungs as _____.

(a)

carbonic acid

(b)

oxyhaemoglobin

(c)

carbamino haemoglobin

(d)

carboxy haemoglobin

Vital capacity is _____.

(a)

TV + IRV

(b)

TV + ERV

(c)

RV + ERV

(d)

TV + TRV + ERV

After a long deep breath, we do not respire for some seconds due to ______.

(a)

more CO₂ in the blood

(b)

more O₂ in the blood

(c)

less CO₂ in the blood

(d)

less O₂ in the blood

Which of the following substances in tobacco smoke damage the gas exchange system?

(a)

carbon monoxide and carcinogens

(b)

carbon monoxide and nicotine

(c)

carcinogens and tar

(d)

nicotine and tar

Which of the following best describes the process of gas exchange in the lungs?

(a)

Air moves in and out of the alveoli during breathing.

(b)

Carbon dioxide diffuses from deoxygenated blood in capillaries into the alveolar air.

(c)

Oxygen and carbon dioxide diffuse down their concentration gradients between blood and alveolar air.

(d)

Oxygen diffuses from alveolar air into the deoxygenated blood.