Question 1

Which of the following best explains why veins are called 'capacitance vessels' in the circulatory system?

Accepted Answer

Because veins can stretch and accommodate large volumes of blood with little change in pressure, acting as blood reservoirs.

Question 2

A patient presents with swelling in the lower legs due to fluid accumulation in the interstitial space. Which of the following changes in capillary dynamics is most likely responsible for this edema?

Accepted Answer

A decrease in blood colloid osmotic pressure (BCOP)

Question 3

Which of the following equations correctly represents the relationship between blood flow ($$F$$), pressure gradient ($$\Delta P$$), and resistance ($$R) in $$the cardiovascular system?

Accepted Answer

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

Question 4

A 65-year-old patient is diagnosed with an aneurysm in the abdominal aorta. Which structural feature of arteries is most directly compromised in this condition?

Accepted Answer

Tunica media

Question 5

During vigorous exercise, blood flow to skeletal muscles increases dramatically. Which mechanism is primarily responsible for this local increase in blood flow?

Accepted Answer

Autoregulation by local vasodilators such as increased $$CO_2$$ and decreased $$O_2$$

Question 6

Which of the following best describes the function of precapillary sphincters in capillary beds?

Accepted Answer

They guard the entrance to each capillary, controlling blood flow into the capillary bed.

Question 7

A patient with severe liver disease develops a buildup of fluid in the abdomen (ascites). Which of the following best explains this phenomenon in terms of capillary exchange?

Accepted Answer

Decreased blood colloid osmotic pressure (BCOP) due to reduced plasma protein synthesis

Question 8

Which of the following statements about the differences between arteries and veins is correct?

Accepted Answer

Arteries have thicker walls and higher blood pressure than veins.

Question 9

Which of the following congenital heart defects results in a 'right-to-left shunt' and is most likely to cause cyanosis in a newborn?

Accepted Answer

Patent ductus arteriosus

Question 10

A patient is found to have a blood pressure of 150/95 mm Hg. What is the mean arterial pressure (MAP) for this patient? Use the formula $$MAP = Diastolic\ Pressure + \dfrac{1}{3} (Systolic\ Pressure - Diastolic\ Pressure).$$

Accepted Answer

$$MAP = 95 + \dfrac{1}{3} (150 - 95) = 113.3\ mm\ Hg$$

Question 11

Which of the following best describes the role of the vasa vasorum in large blood vessels?

Accepted Answer

They are small arteries and veins that supply blood to the cells of the tunica media and tunica externa.

Question 12

A patient with atherosclerosis develops abnormal turbulence in blood flow. Which of the following is the most likely consequence of this turbulence?

Accepted Answer

Increased vascular resistance and decreased blood flow

Question 13

Which of the following capillary types is most likely to be found in the liver and is specialized for the free exchange of water and large plasma proteins?

Accepted Answer

Sinusoids (sinusoidal capillaries)

Question 14

Which hormone is released by the kidneys in response to low blood pressure or low oxygen content in blood, and stimulates both vasoconstriction and red blood cell production?

Accepted Answer

Erythropoietin (EPO)

Question 15

A 70-year-old patient has decreased elasticity of arteries and calcium deposits in vessel walls. Which of the following complications is this patient at increased risk for?

Accepted Answer

Aneurysm and stroke

Question 16

Which of the following best describes the effect of the baroreceptor reflex when blood pressure falls?

Accepted Answer

Increases cardiac output and causes peripheral vasoconstriction

Question 17

Which of the following is a direct effect of antidiuretic hormone (ADH) on the cardiovascular system?

Accepted Answer

Elevates blood pressure by reducing water loss at the kidneys

Question 18

Which of the following best explains why the pulmonary arteries are unique compared to other arteries in the body?

Accepted Answer

They carry deoxygenated blood from the right ventricle to the lungs.

Question 19

A patient with a patent foramen ovale has a 'left-to-right shunt.' What is the primary consequence of this defect on the workload of the heart?

Accepted Answer

The left ventricle must work harder to provide adequate blood flow through the systemic circuit.

Blood Vessels and Circulation: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards