Question 1

Which of the following best describes the relationship between blood flow ($$F$$), pressure gradient ($$\Delta P$$), and resistance ($$R) in $$the circulatory system?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Question 2

A patient has a blood vessel with a pressure gradient of $$20$$ mmHg and a resistance of $$4$$ units. What is the rate of blood flow through this vessel?

Accepted Answer

$$5$$ units$$\;/\;$$min$$^{-1}$$

Question 3

Which of the following changes would most effectively decrease resistance to blood flow in a vessel?

Accepted Answer

Increasing the vessel's diameter

Question 4

During an intense exercise session, which physiological change is most likely to occur in blood vessels to meet increased oxygen demand?

Accepted Answer

Rate of blood flow needs to increase, so $$\Delta P$$ will increase and resistance will decrease.

Question 5

Which analogy best represents increasing resistance to blood flow in blood vessels?

Accepted Answer

Using a thinner, longer straw to drink a thick milkshake.

Question 6

Arteries tend to have thicker walls than veins. What is the primary reason for this?

Accepted Answer

Arteries need to withstand higher blood pressure than veins.

Question 7

If the viscosity of blood increases due to dehydration, what effect will this have on resistance and blood flow?

Accepted Answer

Resistance will increase and blood flow will decrease.

Question 8

A vessel has a constant pressure gradient. Which of the following would result in the greatest rate of blood flow?

Accepted Answer

A short, wide vessel

Question 9

Which factor is most easily altered by the body to regulate resistance in blood vessels?

Accepted Answer

Vessel diameter

Question 10

If the pressure at point A in a vessel is $$15$$ mmHg and at point B is $$8$$ mmHg, what is the pressure gradient ($$\Delta P$$)?

Accepted Answer

$$7$$ mmHg

Question 11

Which of the following would most likely increase resistance to blood flow in a vessel?

Accepted Answer

Decreasing vessel diameter

Question 12

Blood vessels primarily impact resistance to blood flow by:

Accepted Answer

Altering their diameter.

Question 13

If a physiological change causes the resistance between two points in a vessel to decrease, what will happen to the rate of blood flow?

Accepted Answer

It will increase.

Question 14

Which of the following scenarios would result in the lowest resistance and greatest blood flow, assuming the same pressure gradient?

Accepted Answer

A vessel with low viscosity blood and large diameter

Question 15

Which of the following is NOT a major factor affecting resistance in blood vessels?

Accepted Answer

Blood pressure

Question 16

A patient is given a medication that dilates (widens) their blood vessels. What is the expected effect on resistance and blood flow?

Accepted Answer

Resistance will decrease and blood flow will increase.

Question 17

If the pressure gradient ($$\Delta P) $$across a vessel doubles and resistance ($$R) $$remains constant, what happens to blood flow ($$F$$)?

Accepted Answer

Blood flow doubles.

Question 18

Which of the following would most likely occur if a blood vessel becomes longer due to tissue growth?

Accepted Answer

Resistance to blood flow will increase.

Question 19

A person drinks a thick milkshake through a thin, long straw. Which factor is most responsible for the increased resistance they experience?

Accepted Answer

Small diameter and long length of the straw

Question 20

Which of the following would NOT increase resistance to blood flow in a vessel?

Accepted Answer

Shortening vessel length

Hemodynamics: Blood Flow, Pressure, and Resistance

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