Section 3.4 Lecture

Question 1

What is the primary function of the urinary system?

Answer 1

To produce urine, eliminate waste, recycle useful substances, and regulate blood volume.

Question 2

Why is urine considered a valuable diagnostic tool?

Answer 2

Because its properties and contents reflect how the body’s systems are functioning.

Question 3

What normal substances are found in urine?

Answer 3

Water, urea, electrolytes (sodium, potassium), and small amounts of calcium.

Question 4

What test is commonly used in clinics for rapid urine assessment?

Answer 4

Urinalysis using a dipstick.

Question 5

What are the four main types of urine examinations?

Answer 5

Physical, chemical, microscopic, and microbiologic examinations.

Question 6

What does the physical examination of urine assess?

Answer 6

Color and clarity (turbidity).

Question 7

What can abnormal urine color indicate?

Answer 7

Diet (e.g., beets), dehydration, or possible pathology.

Question 8

What is evaluated during the chemical examination of urine?

Answer 8

The presence of substances such as glucose or proteins.

Question 9

Why is glucose in urine considered abnormal?

Answer 9

Because glucose is normally reabsorbed and not excreted.

Question 10

Why are proteins in urine abnormal?

Answer 10

Because proteins should be retained in the bloodstream, not filtered into urine.

Question 11

What is examined during the microscopic analysis of urine?

Answer 11

Cells, crystals, bacteria, parasites, and contaminants.

Question 12

What do crystals in urine suggest?

Answer 12

Possible kidney stone formation.

Question 13

What does the presence of bacteria in urine indicate?

Answer 13

A possible urinary tract infection.

Question 14

Why is microscopic examination important when blood is found in urine?

Answer 14

To help determine the source of bleeding and detect abnormal cells.

Question 15

What is urine cytology used to detect?

Answer 15

Abnormal or cancerous cells.

Question 16

What staining technique is commonly used for urine cytology?

Answer 16

The Papanicolaou (Pap) stain.

Question 17

What is the purpose of microbiologic urine testing?

Answer 17

To culture urine and identify infectious organisms.

Question 18

How does the urinary system help regulate blood volume?

Answer 18

By adjusting the amount of water excreted in urine.

Question 19

Why is understanding urine composition important for this unit?

Answer 19

Because abnormal substances in urine indicate disease states.