An example of diffusion in the respiratory system is movement of:
A) oxygen from the alveoli into the pulmonary capillaries.
B) air from the outside environment into the lungs.
C) oxygen from the tissues into the systemic capillaries.
D) carbon dioxide from the alveoli into the pulmonary capillaries.
Question 2
The amount of blood that returns to the heart during diastole is called:
A) cardiac output.
B) preload.
C) myocardial capacity.
D) afterload.