Question 1

Which of the following best describes the difference between intrinsic and extrinsic controls of blood flow?

Accepted Answer

Intrinsic controls are local adjustments based on the immediate needs of individual organs, while extrinsic controls maintain mean arterial pressure (MAP) and redistribute blood flow throughout the body.

Question 2

During strenuous exercise, which tissue experiences the greatest relative increase in blood flow compared to rest?

Accepted Answer

Skeletal muscle

Question 3

Which equation correctly represents the calculation of net filtration pressure (NFP) at a capillary bed?

Accepted Answer

$$NFP = (HP_c + OP_{if}) - (HP_{if} + OP_c)$$

Question 4

A patient with liver disease develops edema. Which mechanism best explains this finding?

Accepted Answer

Decreased capillary colloid osmotic pressure due to hypoproteinemia

Question 5

Which of the following is a powerful vasodilator released by endothelial cells during metabolic autoregulation?

Accepted Answer

Nitric oxide (NO)

Question 6

In the pulmonary circulation, what is the response of local arterioles to low oxygen levels?

Accepted Answer

Vasoconstriction to divert blood to better-ventilated areas

Question 7

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

Accepted Answer

Capillaries have the greatest total cross-sectional area

Question 8

A patient with a localized blood vessel blockage in the leg develops swelling. Which pressure change most likely causes this edema?

Accepted Answer

Increased capillary hydrostatic pressure

Question 9

Which of the following is a direct effect of increased metabolic activity in skeletal muscle during exercise?

Accepted Answer

Vasodilation of arterioles due to increased H$$^+$$ and CO$$_2$$

Question 10

Which vein is the longest in the human body and is commonly used for coronary bypass grafts?

Accepted Answer

Great saphenous vein

Question 11

Which of the following best describes the role of the hepatic portal vein?

Accepted Answer

It carries nutrient-rich blood from the digestive organs to the liver.

Question 12

Which of the following would most likely result in a negative net filtration pressure (NFP) at the venous end of a capillary?

Accepted Answer

Osmotic pressure in the capillary exceeds hydrostatic pressure in the capillary.

Question 13

Which of the following is NOT a typical cause of edema?

Accepted Answer

Increased lymphatic drainage

Question 14

Which of the following best describes the effect of atrial natriuretic peptide (ANP) on blood vessels?

Accepted Answer

It acts as a vasodilator, decreasing blood pressure.

Question 15

Which of the following is a correct statement about the distribution of blood flow during strenuous exercise?

Accepted Answer

Blood flow to the skin and skeletal muscles increases, while flow to the abdomen decreases.

Question 16

Which pressure is primarily responsible for pulling fluid back into the capillary at the venous end?

Accepted Answer

Capillary osmotic pressure ($$OP_c)$$

Question 17

Which of the following is a likely consequence of a blocked lymphatic vessel?

Accepted Answer

Edema due to impaired drainage of interstitial fluid

Question 18

Which of the following best describes the myogenic response in cerebral blood flow regulation?

Accepted Answer

Cerebral vessels dilate when MAP decreases and constrict when MAP increases.

Question 19

Which of the following is a direct effect of inflammation on capillary exchange?

Accepted Answer

Increased interstitial fluid osmotic pressure due to protein leakage

Blood Flow, Capillary Exchange, and Venous Circulation: Study Notes for Human Anatomy & Physiology

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