Q: Which of the following is the correct formula for Mean Arterial Pressure (MAP)?

$$MAP = (HR \times SV) \times PR$$

Question 1

Which layer of a blood vessel is primarily responsible for regulating blood vessel diameter and thus blood pressure?

Accepted Answer

Tunica media

Question 2

A patient is diagnosed with atherosclerosis, which narrows the diameter of their arteries. According to the relationship $$F = r^4$, what happens to blood flow (F$) as the radius (r$) of the vessel decreases?

Accepted Answer

Blood flow decreases exponentially as radius decreases

Question 3

Which type of capillary is most abundant in the skin and muscles and forms the blood-brain barrier due to tight junctions?

Accepted Answer

Continuous capillaries

Question 4

Which vessel type acts as a blood reservoir, containing about 54% of blood at rest and relies on the skeletal muscle pump for venous return?

Accepted Answer

Veins

Question 5

A patient with severe blood loss is experiencing hypovolemic shock. Which of the following is the primary physiological cause of this condition?

Accepted Answer

Large-scale loss of blood volume

Question 6

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

Accepted Answer

They control blood flow into true capillaries for tissue exchange

Question 7

Which hormone is released from the posterior pituitary and increases blood pressure by promoting water reabsorption and vasoconstriction?

Accepted Answer

Antidiuretic hormone (ADH)

Question 8

If a patient’s blood pressure is measured at 150/95 mmHg, how would this be classified?

Accepted Answer

Hypertension

Question 9

Which of the following mechanisms does NOT aid venous return to the heart?

Accepted Answer

Arterial pressure gradient

Question 10

Which type of circulatory route involves two capillary beds connected in series, such as in the hepatic portal system?

Accepted Answer

Portal system

Question 11

Which of the following is the correct formula for Mean Arterial Pressure (MAP)?

Accepted Answer

$$MAP = (HR 	imes SV) 	imes PR$$

Question 12

Which type of capillary is found in organs such as the liver and bone marrow, allowing passage of large molecules and even blood cells?

Accepted Answer

Sinusoidal capillaries

Question 13

Which of the following would most likely result in increased peripheral resistance (PR)?

Accepted Answer

Decreased vessel diameter

Question 14

Which of the following is a direct effect of baroreceptor activation in response to increased blood pressure?

Accepted Answer

Inhibition of the sympathetic nervous system and stimulation of the parasympathetic nervous system

Question 15

Which of the following best describes laminar blood flow?

Accepted Answer

Blood flows smoothly, faster in the center and slower along the vessel wall

Question 16

Which of the following is true regarding the distribution of blood volume in the cardiovascular system?

Accepted Answer

Systemic veins contain the largest proportion of blood volume at rest

Question 17

Which of the following would most likely cause vascular shock?

Accepted Answer

Extreme vasodilation

Question 18

Which of the following is a function of chemoreceptors in the carotid arteries and aorta?

Accepted Answer

Detect low oxygen and release nitric oxide to increase blood flow

Question 19

Which of the following is a correct statement about arterial anastomoses?

Accepted Answer

They provide alternate pathways for blood to reach a given body region

Question 20

A patient with polycythemia has increased red blood cell count. What effect does this have on blood viscosity and peripheral resistance?

Accepted Answer

Increased viscosity and increased resistance

Blood Vessels: Structure and Function in Human Anatomy & Physiology

Guida di studio - Domande di pratica

Study guide - Flashcard