Breathing and Exchange of gases, Quiz 2

The barrier between the air in alveolus and blood in pulmonary capillary consists of 3 layers and its total thickness

• 1 mm

• more than 1 mm

• much less than 1 mm

• 2 mm

Besides RBC blood plasma also carries O2 in solution. The percentage is –

• 3%

• 97%

• 49%

• 25%

CO₂ is transported –

• By RBC

• As bicarbonates

• In a dissolved state through plasma

• All

Gas exchange in animals always involves –

• Anaerobic cellular respiration

• Diffusion across membranes

• Active transport of gases

• None

Each molecule of haemoglobin when fully saturated carries how many molecules of O₂ –

• 1

• 2

• 4

• 20

Binding of O₂ with haemoglobin is primarily related to –

• PO₂

• PCO2

• H⁺ conc.

• None

Besides PO2 the other factor(s) affecting the binding of O2 with haemoglobin is / are –

• PCO₂

• H^+ conc.

• temperature

• All

Oxygen dissociation curve is –

• J-shaped

• S-shaped

• L-shaped

• Zig-zag

Which of the following is NOT a function of the lungs?

• Metabolism

• Serves as a reservoir of blood for the left ventricle.

• It is a filter to protect the systemic vasculature

• All of the above are true.

Trachea divides into right and left primary bronchi at _____th thoracic vertebra. 

• 4

• 5

• 6

• 9