Excretory Products and Their Elimination
Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

The process of expelling urine from the body is called:

Ultrafiltration
Micturition
Secretion
Reabsorption
2

Micturition is the process of expelling urine from the urinary bladder through the urethra.

The afferent arteriole carries blood:

To the glomerulus
Away from the glomerulus
To the renal pelvis
To the urinary bladder
1

The afferent arteriole carries blood into the glomerulus for filtration.

Which condition results from the complete failure of kidney function, leading to accumulation of urea in blood?

Diabetes mellitus
Glomerulonephritis
Uremia
Renal calculi
3

Uremia is caused by kidney failure, leading to excessive accumulation of urea in the blood, which can be life-threatening.

Which of the following conditions is associated with excessive loss of water due to lack of ADH?

Diabetes mellitus
Diabetes insipidus
Uremia
Glomerulonephritis
2

Diabetes insipidus occurs due to a deficiency of ADH, leading to excessive urine output and dehydration.

What is the main function of the vasa recta in the nephron?

Filtration of blood
Counter-current exchange
Active reabsorption of glucose
Secretion of hydrogen ions
2

The vasa recta helps in maintaining the counter-current exchange mechanism, aiding in urine concentration.

Which type of nephron has a longer loop of Henle and helps in urine concentration?

Cortical nephron
Juxtamedullary nephron
Glomerular nephron
Malpighian nephron
2

Juxtamedullary nephrons have longer loops of Henle that extend deep into the medulla, aiding in urine concentration.

Which statement about the renal threshold of glucose is incorrect?

The renal threshold for glucose is around 180 mg/dL.
If blood glucose levels exceed the renal threshold, glucose appears in urine.
The renal threshold for glucose is the same in all individuals.
Below the renal threshold, all glucose is reabsorbed in the nephron.
3

The renal threshold for glucose can vary among individuals due to physiological conditions.

Which of the following statements regarding the counter-current mechanism is correct?

The counter-current mechanism occurs in the glomerulus.
The Loop of Henle and vasa recta help concentrate urine.
The counter-current system prevents water reabsorption.
The collecting duct plays no role in water reabsorption.
2

The counter-current mechanism in the Loop of Henle and vasa recta creates an osmotic gradient, aiding urine concentration.

Which of the following statements about the collecting duct is incorrect?

The collecting duct is influenced by antidiuretic hormone (ADH).
The collecting duct is involved in the final concentration of urine.
The collecting duct actively filters blood.
The collecting duct reabsorbs water based on the body's hydration level.
3

The collecting duct does not filter blood; filtration occurs in the glomerulus.

Which hormone controls sodium reabsorption in the kidney?

ADH
Aldosterone
Insulin
Glucagon
2

Aldosterone increases sodium reabsorption in the distal convoluted tubule and collecting duct.

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