$$\text{Excretion} = \text{Filtration} - \text{Reabsorption} + \text{Secretion}$$

Question 1

Which of the following is NOT a primary function of the kidneys?

Accepted Answer

Synthesis of bile acids

Question 2

A patient has lost one kidney due to trauma. Which statement best describes their ability to maintain homeostasis?

Accepted Answer

They can survive with one kidney, but may have reduced renal reserve.

Question 3

What is the correct sequence of structures that filtrate passes through in a nephron?

Accepted Answer

Bowman's capsule → Proximal tubule → Loop of Henle → Distal tubule → Collecting duct

Question 4

Where does the majority of water reabsorption occur in the nephron?

Accepted Answer

Proximal convoluted tubule

Question 5

If the glomerular filtration rate (GFR) is $$120\ \mathrm{mL/min}$$, what is the approximate volume of filtrate produced per day?

Accepted Answer

$$172.8\ \mathrm{L}$$

Question 6

Which of the following best describes the effect of sympathetic nervous system activation on the afferent arteriole of the glomerulus?

Accepted Answer

Vasoconstriction, leading to decreased GFR

Question 7

Which equation best represents the relationship among excretion, filtration, reabsorption, and secretion in the nephron?

Accepted Answer

$$	ext{Excretion} = 	ext{Filtration} - 	ext{Reabsorption} + 	ext{Secretion}$$

Question 8

A filtered substance has a plasma concentration above its renal threshold ($$T_{max}). $$What happens to the excess amount?

Accepted Answer

It is excreted in the urine.

Question 9

Which part of the nephron is primarily responsible for the countercurrent multiplication mechanism?

Accepted Answer

Loop of Henle

Question 10

A patient with high blood potassium levels (hyperkalemia) will experience which effect on blood pH?

Accepted Answer

Blood pH will decrease due to decreased hydrogen secretion.

Question 11

Which hormone is released in response to low blood volume and stimulates sodium reabsorption in the distal tubule?

Accepted Answer

Aldosterone

Question 12

What is the main function of the renin-angiotensin-aldosterone system (RAAS)?

Accepted Answer

To increase blood pressure by promoting sodium and water retention

Question 13

Which of the following substances is filtered, reabsorbed, and secreted by the nephron?

Accepted Answer

Potassium

Question 14

Which part of the brain is the thirst center located in?

Accepted Answer

Hypothalamus

Question 15

During dehydration, which hormone increases water reabsorption in the collecting duct?

Accepted Answer

Antidiuretic hormone (ADH)

Question 16

Which of the following best describes the relationship between blood volume, blood pressure, and extracellular fluid volume?

Accepted Answer

Blood volume and extracellular fluid volume are directly related to blood pressure.

Question 17

Which type of neuron stimulates contraction of the urinary bladder during micturition?

Accepted Answer

Parasympathetic neuron

Question 18

What is the approximate volume of urine produced per day in a healthy adult?

Accepted Answer

$$1.5\ \mathrm{L}$$

Question 19

Which of the following is TRUE regarding the internal and external sphincters during urination?

Accepted Answer

The internal sphincter relaxes involuntarily, while the external sphincter relaxes voluntarily.

Question 20

A patient presents with glucose in their urine. Which process in the nephron is most likely impaired?

Accepted Answer

Reabsorption in the proximal convoluted tubule

Urinary System: Self-Assessment and Study Guide

Study Guide - Practice Questions