Тест: Kidney Function and Structure — 9 въпроса

1. What is the renal capsule of the kidney?

A. A fibrous layer surrounding the kidney that provides protection and maintains shape

B. The funnel-shaped cavity that collects urine from the collecting ducts

C. The outer granular region containing glomeruli and tubules

D. The inner region composed of renal pyramids housing the loops of Henle

Answer: (A)

Обяснение

The renal capsule is a tough fibrous layer that surrounds each kidney, providing protection and maintaining the organ's shape. It is distinct from the renal cortex (outer region), renal medulla (inner region with pyramids), and renal pelvis (urine collection area).

2. What is the primary function of the renal capsule surrounding each kidney?

A. Reduces friction and provides protection

B. Regulates urine concentration

C. Filters blood from the renal artery

D. Stores urine before excretion

Answer: (A)

Обяснение

The renal capsule is a tough fibrous layer that protects the kidney and maintains its shape, rather than being involved in filtration or urine storage.

3. Which of the following correctly describes the components of the renal corpuscle in a nephron?

A. Glomerulus and Bowman's capsule

B. Proximal convoluted tubule and Loop of Henle

C. Renal pelvis and ureter

D. Distal convoluted tubule and collecting duct

Answer: (A)

Обяснение

The renal corpuscle consists of the glomerulus, a network of capillaries where blood filtration begins, and Bowman's capsule, a cup-shaped structure that surrounds the glomerulus and collects the filtrate. The other options list structures that are part of the nephron or kidney but are not components of the renal corpuscle.

4. Which part of the nephron is responsible for concentrating urine by creating an osmotic gradient?

A. Loop of Henle

B. Proximal convoluted tubule

C. Bowman's capsule

D. Distal convoluted tubule

Answer: (A)

Обяснение

The Loop of Henle establishes a medullary osmotic gradient essential for urine concentration, unlike other segments that mainly reabsorb water or solutes.

5. What is the primary role of the filtration process in the kidney?

A. To secrete hormones that regulate blood pressure

B. To filter blood plasma, allowing small molecules to pass into the nephron

C. To remove waste products from the blood after urine formation

D. To reabsorb nutrients and water back into the bloodstream

Answer: (B)

Обяснение

The filtration process in the kidney involves filtering blood plasma at the glomerulus, allowing water, ions, and small molecules to pass into Bowman's capsule. This is the initial step in urine formation and is essential for removing waste and regulating blood composition. It does not involve reabsorption, secretion of hormones, or waste removal after urine formation, but rather the initial filtration of blood.

6. Approximately how many nephrons does each human kidney contain?

A. About 100,000

B. Approximately 1 million

C. Around 10 million

D. Nearly 10,000

Answer: (B)

Обяснение

Each kidney contains roughly 1 million nephrons, which are the functional units responsible for filtering blood and forming urine.

7. Which blood vessels supply and drain blood from the kidneys, respectively?

A. Renal vein and artery

B. Renal artery and vein

C. Aorta and vena cava

D. Ureter and urethra

Answer: (B)

Обяснение

The renal artery delivers oxygenated blood into the kidney, while the renal vein drains deoxygenated blood from it.

8. What structures make up the renal corpuscle in the nephron?

A. Glomerulus and Bowman's capsule

B. Loop of Henle and proximal tubule

C. Distal tubule and collecting duct

D. Renal pyramid and calyces

Answer: (A)

Обяснение

The renal corpuscle includes the glomerulus, a capillary network, and Bowman's capsule that surrounds it, where initial blood filtration occurs.

9. Where is the urine collected before it exits the kidney via the ureter?

A. Renal pelvis

B. Renal cortex

C. Renal medulla

D. Calyces

Answer: (A)

Обяснение

The renal pelvis acts as a funnel collecting urine from the calyces, which then channels it into the ureter for transport to the bladder.