8.3 Gaseous Exchange in Humans

Gas diffusion depends on the partial pressure difference between two areas. The gas diffuses from..

• area where its partial pressure is higher to an area where its partial pressure is lower

• area where its partial pressure is lower to an area where its partial pressure is higher

• area that have the same partial pressure with the other area

Oxygen is transported in blood in the form of _______________.

Which gas has the higher partial pressure in the alveolus?

• carbon dioxide

• oxygen

• nitrogen

In the lungs, carbon dioxide will diffuse out from the lungs capillaries into the alveolus.

While oxygen will diffuse into the lung capillaries from the alveolus.

True or False?

• True

• False

What type of blood capillary that carries the oxygenated blood from lungs?

• pulmonary artery

• pulmonary vein

• aorta

• vena cava

Gaseous exchange occurs in the body tissues.

What is the metabolic process that produce carbon dioxide in the body tissues?

• digestion

• respiration

• excretion

• ventilation

Carbon dioxide is transported in three ways.

Which one is the way that most carbon dioxide transported?

• In the form of bicarbonate ion

• In the form of carbaminohaemoglobin

• In the form of carbonic acid

• In the form of carbon dioxide gas

How many percentage of carbon dioxide is dissolved and carried as carbonic acid in the blood?

• 70%

• 23%

• 7%

• 0%