Question 1

Which of the following factors would most directly increase peripheral resistance in the circulatory system?

Accepted Answer

Decreasing the diameter of arterioles

Question 2

A patient is diagnosed with polycythemia, a condition where there is an abnormally high concentration of red blood cells. How would this affect blood flow, according to the relationship between viscosity and resistance?

Accepted Answer

Blood flow would decrease due to increased resistance

Question 3

According to the equation $$ Q = \frac{\Delta P}{R} $$, where $$ Q  is $$blood flow, $$ \Delta P  is $$the pressure difference, and $$ R  is $$resistance, what would happen to blood flow if resistance doubles and pressure difference remains constant?

Accepted Answer

Blood flow would decrease by half

Question 4

Which vessel type is primarily responsible for the regulation of systemic blood pressure and peripheral resistance?

Accepted Answer

Arterioles

Question 5

A patient experiences a sudden drop in blood pressure. Which short-term mechanism is most likely to respond first to restore homeostasis?

Accepted Answer

Baroreceptor reflex increasing sympathetic output

Question 6

If the radius of a blood vessel is reduced by half, how does this affect resistance, according to Poiseuille's Law ($$ R \propto \frac{1}{r^4$} $$)?

Accepted Answer

Resistance increases by a factor of 16

Question 7

Which of the following best describes the function of baroreceptors in blood pressure regulation?

Accepted Answer

They sense changes in blood pressure and send signals to the medulla oblongata

Question 8

During exercise, blood flow to skeletal muscles increases. Which physiological change is most responsible for this redistribution?

Accepted Answer

Dilation of arterioles supplying skeletal muscle

Question 9

Which of the following statements about capillary blood pressure is correct?

Accepted Answer

Capillary pressure is lower than arterial pressure but higher than venous pressure

Question 10

A patient has a blood vessel with a length that is doubled while all other factors remain constant. According to the relationship $$ R \propto L $$, what happens to the resistance?

Accepted Answer

Resistance is doubled

Question 11

Which of the following is the best example of long-term regulation of blood pressure?

Accepted Answer

Renal regulation of blood volume

Question 12

Which of the following would most likely cause an increase in pulse pressure?

Accepted Answer

An increase in stroke volume

Question 13

Which of the following best explains why blood pressure falls as blood moves from arteries to capillaries to veins?

Accepted Answer

Energy is lost due to friction and branching of vessels

Question 14

Which of the following is a direct effect of sympathetic nervous system activation on blood vessels?

Accepted Answer

Vasoconstriction of most systemic arterioles

Question 15

A patient with chronic hypertension is found to have increased peripheral resistance. Which of the following is most likely contributing to this condition?

Accepted Answer

Narrowing of arterioles

Question 16

Which of the following equations correctly relates mean arterial pressure (MAP), cardiac output (CO), and peripheral resistance (PR)?

Accepted Answer

$$ MAP = CO 	imes PR $$

Question 17

Which of the following would most likely occur if baroreceptors detect a sudden increase in blood pressure?

Accepted Answer

Decreased heart rate and vasodilation

Question 18

Which of the following best describes the effect of arteriole constriction on capillary hydrostatic pressure?

Accepted Answer

It decreases capillary hydrostatic pressure

Question 19

Which of the following is the primary reason veins are called capacitance vessels?

Accepted Answer

They store large volumes of blood at low pressure

Question 20

A patient is experiencing a fight-or-flight response. Which of the following changes would you expect to see?

Accepted Answer

Vasodilation of arterioles in skeletal muscle

Blood Flow, Blood Pressure, and Peripheral Resistance: Cardiovascular System Study Notes

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