Excretory Products and Their Elimination
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

The renal pelvis in the human kidney is responsible for:

Formation of urine
Ultrafiltration
Storage of urine before excretion
Concentration of urine
3

The renal pelvis collects urine from the nephrons and stores it before passing it into the ureter.

Which of the following is NOT a function of the kidney?

Regulation of blood pressure
Excretion of nitrogenous waste
Secretion of insulin
Regulation of pH balance
3

The kidney does not secrete insulin; insulin is secreted by the pancreas.

Which of the following conditions occurs due to the accumulation of uric acid crystals in joints?

Uremia
Gout
Renal calculi
Glomerulonephritis
2

Gout occurs due to the accumulation of uric acid crystals in joints, leading to inflammation and pain.

Which type of nitrogenous waste requires the least amount of water for its elimination?

Ammonia
Urea
Uric acid
Creatinine
3

Uric acid is excreted as a semi-solid paste with minimal water loss, primarily by birds and reptiles.

Which excretory product is primarily eliminated through sweat glands?

Bile pigments
Urea
Carbon dioxide
Glucose
2

Small amounts of urea are excreted through sweat glands in the skin.

Which part of the nephron plays a major role in maintaining acid-base balance by secreting hydrogen ions?

Proximal convoluted tubule
Loop of Henle
Distal convoluted tubule
Collecting duct
3

The distal convoluted tubule regulates pH balance by selectively secreting hydrogen ions and reabsorbing bicarbonate ions.

Which statement about urine composition is incorrect?

Urine normally contains urea, uric acid, and creatinine.
Urine is typically free of glucose in healthy individuals.
Urine contains a high concentration of proteins under normal conditions.
Urine is acidic due to metabolic waste products.
3

Under normal conditions, proteins are too large to pass through the glomerular filter and should not be found in urine.

Which of the following statements about renal physiology is incorrect?

The proximal convoluted tubule reabsorbs most of the essential nutrients.
The afferent arteriole carries blood away from the glomerulus.
The Loop of Henle plays a role in urine concentration.
Glomerular filtration is a passive process driven by blood pressure.
2

The afferent arteriole carries blood into the glomerulus, while the efferent arteriole carries blood away.

Which of the following statements about glomerular filtration is correct?

Filtration occurs due to active transport in the glomerulus.
Glomerular filtration is a passive process driven by blood pressure.
The filtrate in the Bowman’s capsule contains red blood cells.
Proteins freely pass through the glomerular filter.
2

Glomerular filtration is a passive process driven by hydrostatic pressure in the glomerular capillaries.

Which hormone regulates water reabsorption in the kidneys?

Aldosterone
Insulin
ADH (Vasopressin)
Thyroxine
3

ADH (Vasopressin) increases water reabsorption in the kidney tubules to reduce water loss.

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