Question 1

Which of the following best describes the primary reason why some organs, such as the kidneys, receive a disproportionately large percentage of the cardiac output?

Accepted Answer

They require more blood for filtration and homeostatic regulation.

Question 2

Flow rate in a blood vessel is defined as:

Accepted Answer

The amount of blood passing through a vessel per unit time.

Question 3

Which equation correctly represents the pressure gradient ($$\Delta P) $$across a blood vessel?

Accepted Answer

$$\Delta P = P_{in} - P_{out}$$

Question 4

Which of the following factors does NOT contribute to vascular resistance according to Poiseuille’s law?

Accepted Answer

Blood pressure

Question 5

Poiseuille’s law for flow rate ($$Q) in a $$vessel is given by which of the following equations?

Accepted Answer

$$Q = \frac{\pi r^4$ \Delta P}{8 \eta l}$$

Question 6

A patient has a condition that increases the viscosity ($$\eta) of $$their blood. According to Poiseuille’s law, what effect will this have on blood flow rate ($$Q) if $$all other factors remain constant?

Accepted Answer

Blood flow rate will decrease.

Question 7

Which blood vessel type is primarily responsible for regulating total peripheral resistance?

Accepted Answer

Arterioles

Question 8

Which of the following features is unique to capillaries compared to arteries and veins?

Accepted Answer

Single layer of endothelial cells

Question 9

Which of the following substances can pass directly through the endothelial cell membrane of capillaries?

Accepted Answer

Lipid-soluble substances

Question 10

Which pressure opposes filtration out of the capillary and is generated by plasma proteins?

Accepted Answer

Plasma colloid osmotic pressure

Question 11

A patient with severe protein malnutrition develops edema. Which pressure change is most likely responsible?

Accepted Answer

Decreased plasma colloid osmotic pressure

Question 12

Which of the following is NOT a function of the lymphatic system?

Accepted Answer

Production of red blood cells

Question 13

Which vessel type acts as the primary capacitance vessels and blood reservoir in the circulatory system?

Accepted Answer

Veins

Question 14

Which of the following factors does NOT facilitate venous return?

Accepted Answer

High venous pressure at the heart

Question 15

Mean arterial pressure (MAP) can be calculated using which of the following equations?

Accepted Answer

$$MAP = CO 	imes TPR$$

Question 16

During hemorrhagic shock, which of the following compensatory mechanisms is activated to restore arterial pressure?

Accepted Answer

Vasoconstriction of arterioles

Question 17

Which of the following best describes the baroreceptor reflex?

Accepted Answer

A feedback system that adjusts heart rate and vessel diameter in response to changes in arterial pressure.

Question 18

Which of the following is a cause of cardiogenic shock?

Accepted Answer

Heart failure due to myocardial infarction

Question 19

Which of the following would most likely increase total peripheral resistance (TPR)?

Accepted Answer

Vasoconstriction of arterioles

Question 20

Which of the following is the most important factor in determining the rate of exchange of small water-soluble substances across the capillary wall?

Accepted Answer

The size of the pores between endothelial cells

Vessel Physiology: Study Guide and Key Concepts

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