Question 1

Which of the following best explains why blood flow through the pulmonary circuit is equal to that of the systemic circuit, despite the pulmonary circuit having a much lower pressure gradient?

Accepted Answer

The pulmonary circuit has a much lower resistance than the systemic circuit.

Question 2

According to the equation $$F = \Delta P / R$$, what would happen to blood flow if the total peripheral resistance (TPR) doubles while mean arterial pressure (MAP) remains constant?

Accepted Answer

Blood flow would be halved.

Question 3

Which vessel type is primarily responsible for regulating resistance to blood flow and thus plays a key role in controlling mean arterial pressure (MAP)?

Accepted Answer

Arterioles

Question 4

A patient has a mean arterial pressure (MAP) of 100 mm Hg and a central venous pressure (CVP) of 2 mm Hg. If their cardiac output (CO) is 5 L/min, what is their total peripheral resistance (TPR)? Use the equation $$CO = (MAP - CVP)/TPR.$$

Accepted Answer

$$TPR = 19.6 mm Hg$$·min/L

Question 5

Which of the following best describes the function of capillaries in the circulatory system?

Accepted Answer

They are the primary site of exchange of nutrients and waste products between blood and tissues.

Question 6

Which of the following changes would most likely result in an increase in mean arterial pressure (MAP), assuming cardiac output remains constant?

Accepted Answer

An increase in total peripheral resistance (TPR)

Question 7

Which vessel type is considered a 'volume reservoir' due to its high compliance and ability to store large amounts of blood?

Accepted Answer

Veins

Question 8

A patient experiences a hemorrhage. Which of the following compensatory changes would you expect to see in the short term, according to the baroreceptor reflex?

Accepted Answer

Increased heart rate and increased total peripheral resistance

Question 9

Which of the following best describes the relationship between compliance and pressure in blood vessels?

Accepted Answer

Vessels with low compliance require a large increase in volume to produce a significant increase in pressure.

Question 10

Which of the following equations correctly expresses the relationship between mean arterial pressure (MAP), cardiac output (CO), and total peripheral resistance (TPR)?

Accepted Answer

$$MAP = CO 	imes TPR$$

Question 11

Which of the following is a correct statement about the exchange of materials across capillary walls?

Accepted Answer

Small, water-soluble substances cross primarily through water-filled pores by diffusion.

Question 12

Which of the following best explains why mean arterial pressure (MAP) is considered a weighted mean rather than a simple arithmetic mean of systolic and diastolic pressures?

Accepted Answer

The heart spends more time in diastole than in systole during the cardiac cycle.

Question 13

Which of the following would most likely cause edema in the interstitial space?

Accepted Answer

An increase in capillary hydrostatic pressure

Question 14

Which of the following best describes the function of erythropoietin (EPO) secreted by the kidneys?

Accepted Answer

It stimulates the production of red blood cells in response to hypoxemia.

Question 15

Which of the following is true regarding the chemical equation $$CO_2 + H_2O$$ \xleftrightarrow{	ext{carbonic anhydrase}} H_2CO_3 \xleftrightarrow{} H^+ + $$HCO_3$$^-$$?

Accepted Answer

Bicarbonate ($$HCO_3$$^-$$) is the basic component, and hydrogen ion (H$$^+$$) is the acidic component.

Question 16

Which of the following is a correct statement about the shape and properties of a normal red blood cell?

Accepted Answer

It is biconcave, which increases surface area for gas exchange and allows flexibility to pass through capillaries.

Anatomy & Physiology Study Guide: Blood Flow, Pressure, and Vascular Physiology

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