2020 - Respiratory 2

Which does not occur during internal respiration?

• Oxygen diffuses into tissue fluid

• Carbon dioxide diffuses into the blood

• Hemoglobin binds more oxygen

• Bicarbonate ions are formed in RBCs

For any partial pressure of oxygen, if the concentration of 2,3-BPG increases,

• oxygen unloading will decrease

• oxygen levels in hemoglobin will be unaffected

• amount of oxygen unloading will increase

An increase in the partial pressure of carbon dioxide in arterial blood causes chemoreceptors to stimulate the respiratory centers, resulting in

• a decreased respiratory rate

• an increased respiratory rate

• hypocapnia

• hypercapnia

Increases in dissolved nitrogen in the blood at high pressure can cause decompression sickness after scuba diving. This illustrates:

• Boyle's law

• Dalton's Law

• Henry's Law

• Bohr effect

In an obstructed alveolus, the pCO2 will rise. In this scenario, which mechanism will allow the V/Q ratio to remain in the normal range?

• vasoconstriction

• vasodilation

• bronchoconstriction

• bronchodilation