50 multiple-choice quizzes on Human Excretory System

50 multiple-choice quizzes on the Human Excretory System:




🧠 Human Excretory System – MCQs
1.​ Which organ is the main excretory organ in humans?​
A. Lungs​
B. Kidney​
C. Liver​
D. Skin​
Answer: B​

2.​ What is the functional unit of the kidney?​
A. Neuron​
B. Nephron​
C. Alveolus​
D. Glomerulus​
Answer: B​

3.​ Which part of the nephron filters blood?​
A. Loop of Henle​
B. Bowman’s capsule​
C. Collecting duct​
D. Ureter​
Answer: B​

4.​ Urine is stored in the:​
A. Urethra​
B. Ureter​
C. Urinary bladder​
D. Renal pelvis​
Answer: C​

5.​ Which blood vessel brings blood to the kidney?​
A. Renal vein​
B. Renal artery​
C. Hepatic vein​
D. Jugular vein​
Answer: B​

6.​ What is the normal color of urine?​
A. Red​
B. Yellow​

, C. Green​
D. White​
Answer: B​

7.​ Which waste is removed by the lungs?​
A. Urea​
B. Water​
C. Carbon dioxide​
D. Bile​
Answer: C​

8.​ Which waste is mainly excreted by kidneys?​
A. Sweat​
B. CO₂​
C. Urea​
D. Bile​
Answer: C​

9.​ Which part reabsorbs water and nutrients in the nephron?​
A. Bowman’s capsule​
B. Collecting duct​
C. Proximal tubule​
D. Ureter​
Answer: C​

10.​The tube that connects kidneys to the bladder is called:​
A. Urethra​
B. Nephron​
C. Ureter​
D. Tubule​
Answer: C​




Continue (11–50)

11.​Kidneys help regulate:​
A. Heart rate​
B. Blood sugar​
C. Water balance​
D. Digestion​
Answer: C​