BP Cap

Which of the following is most closely related to vasoconstriction/vasodilation?

• Collagen and elastic fibers in the tunica media

• Endothelium of the tunica interna

• Smooth muscle of the tunica media

• Fenestrations of the tunica externa

the formula used to calculate blood flow to an area is

• P=F/R

• R=F/p

• F=P/R

• F=R/P

In the above question, F, P, and R are symbolic of:

• Flow, pressure, resistance

• Flow, partial, resistance

• Feedback pressure requirement

• The correct answer is not listed

Vasoconstriction

• Decrease in resistance

• occurs when there is a decrease in the radius of a vessel

• Is due to decrease in sympathetic activity

• ALL are correct

If a person has a blood pressure of 130/100, what is their mean arterial pressure?

• 93mmHg

• 100mmHg

• 110mmHg

• 37mmHg

What happens to MAP between the aorta and the vena cava under normal conditions?

• MAP decreases only within the capillary portion of the circuit, but remains constant otherwise

• MAP decreases rapidly in the arterial portion of the circuit but decreases only minimally in the venous portion of the circuit

• MAP stays relatively the same throughout the circuit

• MAP increases rapidly in the arterial portion of the circuit, but increases only minimally in the venous portion of the circuit

To regulate blood pressure specific receptors must initiate sensory information to the brain. One important pressure receptor, a _____, is located in the _______

• Baroreceptor, skeletal muscles

• Exteroceptor, carotid sinus

• Chemoreceptor, carotid sinus

• Baroreceptor, carotid sinus

Blood flow is affected by:

• Pressure differences throughout the systemic circuit

• The viscosity of the blood

• The length and diameter of the blood vessels

• The amount of friction occuring in the blood vessels

• All of the above

Which is NOT true of blood pressure?

• Its maximal during ventricular systole

• It increases the farther away from the heart the blood flows

• It increases with increasing resistance

• It can be increased by direct parasympathetic pathways

In the circulatory system, resistance increases when:

• Arteriole radius decreases

• Vessel length decreases

• Blood viscosity decreases

• Arteriole radius increases