Biology

Human Excretion and Kidney Physiology

1,152 Questions

Human excretion and kidney physiology questions test your understanding of the excretory system, including the role of renal tubules and glomerular filtration. You will also find topics on urine formation, body water absorption, and excretory products. This section is vital for medical and general science exam preparation.

Glomerular filtrationRenal tubule absorptionExcretory productsRole of sodium ionsHuman excretory system

Human Excretion and Kidney Physiology Questions

Multiple choice

The bladder stores?

  1. red blood cells

  2. white blood cells

  3. urine

  4. digestive juices
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The urinary bladder is a hollow muscular organ that collects and stores urine produced by the kidneys before it is excreted from the body.

Multiple choice

Which option lists the directional sequence of urine from the kidney?

  1. Kidney, ureter, urinary bladder, urethra, urethral opening.

  2. Kidney, urethra, ureter, urinary bladder, bladder opening.

  3. Kidney, urethral opening, ureter, urethra.

  4. Kidney, urethra, urinary bladder, ureter, urethral opening.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Urine is produced in the kidneys, travels down the ureters to the bladder, and is eventually expelled through the urethra. This is the standard anatomical pathway.

Multiple choice

What is the role of the urinary bladder?

  1. Temporary storage or urine

  2. Regulation of urinal output from the kidneys

  3. Recycling of essential salts back into the blood

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The primary role of the urinary bladder is to act as a reservoir for urine, allowing for controlled and infrequent urination. The kidneys perform the other functions listed.

Multiple choice

What is the function of the ureters?

  1. Connect the kidneys to the inferior vena cava

  2. Connect the Kidneys to the adrenal gland

  3. Connect the kidneys to the urinary bladder

  4. Connect the urinary bladder to the external urethral opening
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ureters are the muscular tubes that transport urine from the renal pelvis of the kidneys to the urinary bladder.

Multiple choice

Think about the digestive system. In humans, the right kidney is positioned slightly lower than the left kidney. Why?

  1. The left kidney is crowded upwards by the liver.

  2. The right kidney is crowded downwards by the liver.

  3. Lung position effects the position of the left kidney.

  4. Both kidneys are at exactly the same level in humans.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The liver is a large organ located on the right side of the abdominal cavity, which pushes the right kidney slightly lower than the left one.

Multiple choice

What is the function of nephron?

  1. filters waste from blood

  2. Filters the nutrients we absorb

  3. Filters salt levels in the blood

  4. Filters the food we eat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nephron is the functional unit of the kidney. Its primary role is to filter waste products, excess salts, and water from the blood to produce urine, thereby maintaining homeostatic balance.

Multiple choice

Why is it important that the Loop of Henle passes into the Kidney's medulla?

  1. To allow waste move through by osmosis

  2. Establish an ion gradient so H2O can move through by osmosis

  3. ensure nutrients pass through

  4. establish an ion gradient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Loop of Henle descends into the highly concentrated (hypertonic) medulla of the kidney to establish and maintain an osmotic gradient. This gradient allows water to be reabsorbed from the collecting duct and descending limb via osmosis, concentrating the urine.

Multiple choice

End stage renal disease belongs to which organ ?

  1. Brain

  2. Lungs

  3. Heart

  4. Kidney
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Renal refers to anything related to the kidneys. Therefore, end-stage renal disease (ESRD) is the final, permanent stage of kidney failure, where the kidneys can no longer function on their own.