Exam 37: Gas Exchange & Transport

The PCO₂ in the atmosphere is:

If the PCO₂ is greater in the cells than in the intercellular fluid, CO₂ will remain in the cells.

Carbon dioxide is carried in three forms in the blood. Ranking them from greatest to least amount carried, the sequence would be:

Iron is important in hemoglobin because it carries oxygen to the cells and carbon dioxide away from the cells.

The terms oxygen partial pressure and oxygen tension are interchangeable.

In a resting person, the oxygen saturation in the systemic venous blood is still about 50%.

The formation of carbaminohemoglobin is a reversible reaction.

The enzyme in blood plasma that helps form carbaminohemoglobin is carbonic anhydrase.

Assume the percent of oxygen in the air is constant (about 21%). What is the partial pressure of oxygen in the mountains, where the atmospheric pressure is 725 mm Hg?

An increase in carbon dioxide would have the opposite effect on oxygen-hemoglobin dissociation than would a drop in blood pH.

In the lung oxygen moves down its pressure gradient, whereas carbon dioxide moves up its pressure gradient.

Identify the major factors that help determine the amount of oxygen that diffuses into the blood each minute.

Increased cellular activity would increase the oxygen gradient between the cells and the arterial blood.

Oxygenated blood contains equal amounts of both dissolved oxygen and oxygen combined with hemoglobin.

Explain the process by which oxygen is transported by the blood.

The PO₂ is higher in the femoral artery than in the femoral vein.

Which of the following helps determine the amount of oxygen that diffuses into the blood each minute?

Because of tissue layers between alveolar air and the blood supply, arterial blood PO₂ is always less than alveolar PO₂.

Explain Dalton law as it relates to the movement of oxygen from the lungs into the circulatory system.

Explain the process by which carbon dioxide is transported by the blood.