Q: A patient has a mean arterial pressure (MAP) of 93 mmHg, a systolic pressure of 120 mmHg, and a diastolic pressure of 80 mmHg. Which formula correctly calculates MAP, and what is the value?

$$\text{MAP} = \text{Diastolic} + \frac{1}{3}(\text{Systolic} - \text{Diastolic}) = 80 + \frac{1}{3}(120 - 80) = 93\ \text{mmHg}$$

Question 1

Which structural feature is unique to veins and plays a critical role in preventing the backflow of blood, especially in the limbs?

Accepted Answer

Valves

Question 2

A patient stands up quickly after lying down and experiences dizziness. Which cardiovascular mechanism is primarily responsible for adjusting blood pressure in this scenario?

Accepted Answer

Baroreceptor reflex

Question 3

Which of the following best describes the structure of a capillary and its primary function?

Accepted Answer

A single layer of endothelial cells allowing exchange of gases, nutrients, and wastes

Question 4

Which vessels serve as the primary blood reservoirs in the body, containing the largest proportion of total blood volume at rest?

Accepted Answer

Veins and venules

Question 5

A patient has a mean arterial pressure (MAP) of 93 mmHg, a systolic pressure of 120 mmHg, and a diastolic pressure of 80 mmHg. Which formula correctly calculates MAP, and what is the value?

Accepted Answer

$$	ext{MAP} = 	ext{Diastolic} + \frac{1}{3}(	ext{Systolic} - 	ext{Diastolic}) = 80 + \frac{1}{3}(120 - 80) = 93\ 	ext{mmHg}$$

Question 6

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

Accepted Answer

Resistance to flow increases due to smaller vessel diameters and increased total cross-sectional area

Question 7

Which type of capillary is most permeable and found in locations such as the liver and bone marrow?

Accepted Answer

Sinusoids

Question 8

A patient with chronic hypertension is found to have increased peripheral resistance. Which factor most directly contributes to increased peripheral resistance?

Accepted Answer

Increased blood viscosity

Question 9

Which hormone is primarily responsible for the long-term regulation of blood pressure by increasing sodium and water reabsorption in the kidneys?

Accepted Answer

Aldosterone

Question 10

During exercise, local tissues experience increased levels of CO$$_2$$ and decreased pH. Which mechanism is primarily responsible for increasing blood flow to these tissues?

Accepted Answer

Autoregulation via local metabolic control

Question 11

Which of the following best describes the function of precapillary sphincters?

Accepted Answer

They control blood flow into individual capillary beds

Question 12

A patient with liver disease has impaired function of the hepatic portal system. Which of the following is a direct consequence of this impairment?

Accepted Answer

Impaired detoxification of substances absorbed from the gastrointestinal tract

Question 13

Which of the following equations correctly relates blood flow ($$F$$), pressure gradient ($$\Delta P$$), and resistance ($$R$$)?

Accepted Answer

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

Question 14

Which of the following best describes an anastomosis?

Accepted Answer

A direct connection between two arteries or two veins, providing alternate routes for blood flow

Question 15

Which of the following is NOT a process responsible for capillary exchange?

Accepted Answer

Active transport

Question 16

A newborn is diagnosed with a patent ductus arteriosus, a fetal vessel that failed to close after birth. What is the normal function of the ductus arteriosus in fetal circulation?

Accepted Answer

To shunt blood from the pulmonary artery to the aorta, bypassing the fetal lungs

Question 17

Which of the following best explains why the rate of blood flow is lowest in the capillaries?

Accepted Answer

Capillaries have the greatest total cross-sectional area

Question 18

Which of the following is a characteristic of elastic (conducting) arteries?

Accepted Answer

They help maintain continuous blood flow by expanding and recoiling with each heartbeat

Question 19

Which short-term mechanism is most important for rapidly increasing blood pressure during acute blood loss?

Accepted Answer

Sympathetic nervous system activation

Question 20

Pulse pressure is defined as the difference between systolic and diastolic blood pressure. If a patient has a systolic pressure of 130 mmHg and a diastolic pressure of 85 mmHg, what is the pulse pressure?

Accepted Answer

$$130 - 85 = 45\ 	ext{mmHg}$$

BIO 1222 Cardiovascular System Study Guide – Blood Vessels

Study Guide - Practice Questions

Study Guide - Flashcards