Circulatory Physiology Quiz

T/F: Vascular smooth muscle is innervated by the sympathetic nervous system.

T/F: Increases in stimulation of the sympathetic nervous system causes vasoconstriction.

T/F: Vasodilation can occur due to increases in local metabolites like H+, NO, and decreased pCO2.

Name 2 types of capillaries? Where in the body is there an example of each?

An acute decrease in mean arterial pressure results in which of the following compensatory changes?

• a. Decreased firing rate of the carotid sinus nerve

• b. Increased parasympathetic outflow to the heart

• c. Increased heart rate

• d. Decreased contractility

Starling’s law of the capillaries describes net filtration pressure as regulated most by:

• a. Blood hydrostatic pressure and blood colloid osmotic pressure

• b. Interstitial fluid hydrostatic pressure and blood colloid osmotic pressure

• c. Blood hydrostatic pressure and interstitial fluid osmotic pressure balanced by blood colloid osmotic pressure and interstitial fluid hydrostatic pressure

• d. Blood hydrostatic pressure and interstitial fluid hydrostatic pressure balanced by blood colloid osmotic pressure and interstitial fluid osmotic pressure

• e. Blood hydrostatic pressure and blood colloid osmotic pressure balanced by interstitial fluid hydrostatic pressure and interstitial fluid osmotic pressure

What are the factors that determine vascular resistance? Which vessels contribute most to changes in total vascular resistance?

Describe the difference between veins and arteries? Use these terms in your answer, Capacitance, Blood Volume, Smooth Muscle, Backflow, and Pressure.

How does Ohm’s law apply to the heart?

Why does blood velocity greatly slow at the arteriole-capillary interface?