Question 1

Which layer of a blood vessel wall is primarily responsible for vasoconstriction and vasodilation, and what type of tissue predominates in this layer?

Accepted Answer

Tunica media; smooth muscle

Question 2

A patient’s blood pressure is measured at 130/85 mmHg. Using the formula $$MAP = \frac{1}{3} (Systolic - Diastolic) + Diastolic$$, what is the mean arterial pressure (MAP)?

Accepted Answer

$$MAP = \frac{1}{3} (130 - 85) + 85 = \frac{1}{3} (45) + 85 = 15 + 85 = 100$$ mmHg

Question 3

Which type of blood vessel is the major determinant of peripheral resistance, and why?

Accepted Answer

Arterioles, because their diameter can be easily changed by vasomotion

Question 4

If the radius of a blood vessel doubles, by what factor does the resistance change according to the formula $$R \propto \frac{1}{r^4$}$$?

Accepted Answer

Resistance decreases to 1/16th of its original value

Question 5

Which of the following best describes the function of capillaries in microcirculation?

Accepted Answer

They are the primary site of exchange of nutrients, gases, and wastes between blood and tissues

Question 6

Which adaptation in veins helps ensure blood returns to the heart, especially from the lower limbs?

Accepted Answer

Presence of valves

Question 7

A patient has a systolic pressure of 110 mmHg and a diastolic pressure of 70 mmHg. What is the pulse pressure?

Accepted Answer

$$Pulse\ Pressure = Systolic - Diastolic = 110 - 70 = 40$$ mmHg

Question 8

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

Accepted Answer

Blood oxygen content

Question 9

Which type of artery is known as a 'distributing artery' and has a thick tunica media?

Accepted Answer

Muscular artery

Question 10

Why is low pressure necessary in capillaries?

Accepted Answer

To prevent rupture and allow time for exchange of materials

Question 11

Which vessel carries blood away from the heart in the systemic circuit, and is the blood fully oxygenated or not?

Accepted Answer

Arteries; fully oxygenated

Question 12

Which of the following best describes an anastomosis?

Accepted Answer

A connection between two blood vessels that allows for alternate routes of blood flow

Question 13

If the pressure gradient across a vessel increases, what happens to blood flow according to the formula $$Flow \propto Pressure\ Gradient$$?

Accepted Answer

Blood flow increases

Question 14

Which of the following is true about laminar flow in blood vessels?

Accepted Answer

It describes smooth, orderly movement of blood, with resistance decreasing as vessel radius increases

Question 15

Which type of capillary is most permeable and found in organs such as the liver and spleen?

Accepted Answer

Sinusoidal capillary

Question 16

Which of the following best explains why resistance is more important than pressure in influencing local blood flow?

Accepted Answer

Resistance can be easily changed by altering vessel diameter

Question 17

Which vessel is used for exchange with tissues in a capillary bed?

Accepted Answer

True capillary

Question 18

Which of the following is a function of vasomotor tone?

Accepted Answer

Maintains partial constriction of blood vessels to regulate blood pressure

Question 19

Which of the following is true regarding systemic blood pressure?

Accepted Answer

It is generated by the contraction of the heart and is highest in the aorta

Question 20

Which of the following best describes autoregulation in blood flow?

Accepted Answer

The ability of tissues to regulate their own blood supply in response to local needs

Blood Vessels and Hemodynamics: Structure, Function, and Regulation

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