Left atrium

Inferior vena cava

Superior vena cava

Pulmonary arteries

Right atrium

higher . . . lower

lower . . . higher

lower . . . equal

higher . . . equal

Oxygen is carried by hemoglobin

Oxygen is free floating in the plasma of the blood

Oxygen is carried by white blood cells

Oxygen diffuses through all the cells in the body

Oxygen diffuses into the cell membranes of red blood cells

Pressure decreases

Pressure increases

Pressure remains constant

Pressure decreases, then increases

Pressure increases, then decreases

The partial pressure of oxygen is lower in systemic arteries than in systemic veins

Gases move between alveoli and blood vessels via passive diffusion

The partial pressure of carbon dioxide is lower in the systemic arteries than it is in the body tissues

In the lungs, oxygen diffuses from the alveoli into the blood vessels

Carbon dioxide diffuses from the blood vessels into the alveoli for expiration

Acidosis

Alkalosis

Combustion

Auto-immune disease

Decreased heart rate

Lung pressure must be higher than atmospheric pressure

Lung pressure must be lower than atmospheric pressure

Lung pressure must be equal to atmospheric pressure

Lung pressure should not change during the process