The cardiovascular system consists of which two routes of circulation?
a. Systemic and pulmonary
b. Hepatic and portal
c. Primary and secondary
d. Cardio-thoracic and renal
Question 2
The exchange of materials, nutrients, and gases between the blood and the tissues is the primary function of the _____.
a. arteries
b. arterioles
c. capillaries
d. venules