40. Circulatory System

Which of the following would increase the release of oxygen from red blood cells?

When you hold your breath, which of the following blood gas changes leads initially to the urge to breathe again?

What causes CO₂ in the blood to decrease?

When you exhale, __________.

In the alveoli and lung capillaries, carbon dioxide and oxygen are exchanged by means of __________.

Which structure in a human is most similar in function to the gill lamellae of a fish?

What happens when the CO₂ level from cellular respiration increases in the blood?

What is the major reason that land-dwelling mammals evolved lungs rather than gills as a primary respiratory organ?

What is the correct order of structures through which air passes as it is inhaled by a typical mammal?

Which of the following components of the mammalian gas exchange system has a surface covered by a thin film of fluid without cilia?

Countercurrent flow in the gills of a fish __________.

Which respiratory organ is most often found only in fully aquatic animals?

Gas exchange in the gills of a bony fish is maximized by which of the following?

For a body surface to be a respiratory surface, it must __________.