Q: Calculate the mean arterial pressure (MAP) for a patient with a blood pressure of 135/90 mm Hg. Use the formula $$MAP = \text{Diastolic Pressure} + \frac{1}{3} \times \text{Pulse Pressure}.$$

$$MAP = 90 + \frac{1}{3} \times (135 - 90) = 105 mm Hg$$

Question 1

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

Accepted Answer

Tunica media; composed of smooth muscle cells

Question 2

A patient presents with an aneurysm in the aorta. Which property of elastic arteries is most compromised in this condition?

Accepted Answer

Ability to act as pressure reservoirs by expanding and recoiling

Question 3

Which type of capillary is most abundant in the skin and muscles, and what is its primary permeability characteristic?

Accepted Answer

Continuous capillary; least permeable with tight junctions and intercellular clefts

Question 4

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

Accepted Answer

Intrinsic control causing arteriolar dilation in skeletal muscle

Question 5

Which equation correctly relates blood flow ($$F$$), pressure gradient ($$\Delta P$$), and total peripheral resistance ($$TPR$$)?

Accepted Answer

$$F = \Delta P / TPR$$

Question 6

If the radius of a blood vessel is reduced by half, by what factor does the resistance to blood flow increase?

Accepted Answer

Resistance increases by 16 times

Question 7

Which adaptation in veins helps ensure the return of blood to the heart, especially from the limbs?

Accepted Answer

Presence of venous valves

Question 8

A patient with chronic hypertension may have baroreceptors that are less effective at regulating blood pressure. What is the physiological reason for this?

Accepted Answer

Baroreceptors adapt to sustained high pressure and become less sensitive

Question 9

Which hormone acts both as a vasoconstrictor and stimulates the kidneys to conserve water, thereby increasing blood pressure?

Accepted Answer

Antidiuretic hormone (ADH, also called vasopressin)

Question 10

Calculate the mean arterial pressure (MAP) for a patient with a blood pressure of 135/90 mm Hg. Use the formula $$MAP = 	ext{Diastolic Pressure} + \frac{1}{3} 	imes 	ext{Pulse Pressure}.$$

Accepted Answer

$$MAP = 90 + \frac{1}{3} 	imes (135 - 90) = 105 mm Hg$$

Question 11

Which of the following is the primary determinant of total peripheral resistance (TPR) in the vascular system?

Accepted Answer

Blood vessel diameter

Question 12

Bulk flow across capillary walls is governed by the net filtration pressure (NFP). Which equation correctly represents NFP?

Accepted Answer

$$NFP = (HP_c + OP_i) - (HP_i + OP_c)$$

Question 13

Which of the following mechanisms is responsible for the movement of water-soluble molecules such as amino acids and sugars across capillary walls?

Accepted Answer

Passage through intercellular clefts and fenestrations

Question 14

A patient is experiencing severe dehydration. Which hormone will be released to conserve water, and what is its primary site of action?

Accepted Answer

Antidiuretic hormone (ADH); acts on the kidneys

Question 15

Which of the following statements best explains why blood flow velocity is slowest in the capillaries?

Accepted Answer

Capillaries have the largest total cross-sectional area

Question 16

Which of the following is NOT a function of the tunica externa in blood vessels?

Accepted Answer

Regulating vasoconstriction and vasodilation

Question 17

Which of the following would most likely result in edema?

Accepted Answer

Increased capillary hydrostatic pressure

Question 18

Which vessel type is most likely to collapse in histological preparations due to its thin wall and large lumen?

Accepted Answer

Vein

Question 19

Which of the following is a direct effect of angiotensin II on blood pressure regulation?

Accepted Answer

Acts as a potent vasoconstrictor to increase TPR

Question 20

Which of the following best describes the role of baroreceptors in short-term blood pressure regulation?

Accepted Answer

They detect stretch in vessel walls and send signals to the cardiovascular center

Chapter 19: The Cardiovascular System – Blood Vessels (Anatomy & Physiology Study Notes)

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