Question 1

Which of the following best describes the difference between the portal and systemic venous blood circulation in the liver?

Accepted Answer

Portal circulation delivers nutrient-rich blood from the gastrointestinal tract to the liver for processing, while systemic circulation returns deoxygenated blood from the liver to the heart.

Question 2

A patient has a mutation that causes their parathyroid hormone (PTH) to be overproduced. Which of the following would most likely be observed in this patient?

Accepted Answer

Increased calcium reabsorption in the kidneys and increased bone resorption, leading to hypercalcemia.

Question 3

Which of the following best explains why aldosterone increases sodium reabsorption in the nephron?

Accepted Answer

Aldosterone increases the number of sodium-potassium pumps in the distal convoluted tubule, leading to increased sodium reabsorption and water retention.

Question 4

A patient is experiencing metabolic acidosis. Which of the following renal mechanisms would help compensate for this condition?

Accepted Answer

Increased secretion of hydrogen ions ($$\mathrm{H^+}) $$and increased reabsorption of bicarbonate ($$\mathrm{$$HCO_3$$^-}) in $$the proximal and distal tubules.

Question 5

Which of the following best describes the effect of sympathetic stimulation on the heart?

Accepted Answer

It increases heart rate and contractility by increasing the influx of calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$into cardiac muscle cells.

Question 6

A patient has a blood pressure of 120/80 mmHg. What is their mean arterial pressure (MAP)? Use the formula $$\mathrm{MAP = Diastolic\ Pressure + \frac{1}{3} (Systolic\ Pressure - Diastolic\ Pressure)}.$$

Accepted Answer

$$\mathrm{MAP = 80 + \frac{1}{3}(120-80) = 80 + 13.3 = 93.3\ mmHg}$$

Question 7

Which of the following would most likely occur if the glomerular filtration rate (GFR) decreases significantly?

Accepted Answer

Waste products such as urea and creatinine would accumulate in the blood, leading to azotemia.

Question 8

Which of the following best describes the role of surfactant in the lungs?

Accepted Answer

Surfactant decreases surface tension in the alveoli, preventing alveolar collapse during exhalation.

Question 9

A patient is given a diuretic that inhibits sodium reabsorption in the ascending limb of the loop of Henle. What is the most likely effect on urine concentration?

Accepted Answer

Urine will become more dilute because less sodium is reabsorbed, reducing the osmotic gradient in the medulla.

Question 10

Which of the following is a correct sequence of events during the cardiac cycle?

Accepted Answer

Atrial systole, ventricular systole, ventricular diastole, atrial diastole

Question 11

Which of the following best explains why the pancreas secretes bicarbonate into the duodenum?

Accepted Answer

To neutralize acidic chyme from the stomach, protecting the intestinal mucosa and providing an optimal pH for digestive enzymes.

Question 12

Which of the following is a primary function of the large intestine?

Accepted Answer

Absorption of water and electrolytes, and formation of feces.

Question 13

A patient has a mutation that prevents the production of intrinsic factor in the stomach. Which nutrient will they have difficulty absorbing?

Accepted Answer

Vitamin B12

Question 14

Which of the following best describes the effect of antidiuretic hormone (ADH) on the nephron?

Accepted Answer

ADH increases the permeability of the collecting duct to water, resulting in increased water reabsorption and more concentrated urine.

Question 15

Which of the following best explains why the left ventricle has a thicker wall than the right ventricle?

Accepted Answer

The left ventricle must generate higher pressure to pump blood through the systemic circulation.

Question 16

Which of the following is a correct description of tidal volume?

Accepted Answer

The volume of air inhaled or exhaled during a normal, quiet breath.

Question 17

Which of the following best explains the importance of villi and microvilli in the small intestine?

Accepted Answer

They increase the surface area for absorption of nutrients.

Question 18

A patient is unable to produce sufficient bile. Which of the following would most likely be impaired?

Accepted Answer

Digestion and absorption of dietary fats.

Question 19

Which of the following best describes the effect of angiotensin II on the kidneys?

Accepted Answer

It constricts efferent arterioles, increases sodium reabsorption, and stimulates aldosterone release, all of which increase GFR.

Comprehensive Study Guide: Endocrine, Cardiovascular, Urinary, Respiratory, and Digestive Systems

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