Biology · Science General

Human Digestive System

2,002 Questions

The human digestive system explores the breakdown of biomacromolecules, covering organs from the stomach to the small intestine. It involves physiological processes like chyme movement, pH levels, and nutrient absorption in the gut. These fundamental biology concepts are regularly featured in medical and general science competitive exams.

Small intestine functionsBiomacromolecule breakdownStomach and digestionIntestinal bacteria

Human Digestive System Questions

Multiple choice

Principal absorptive organ in a horse is

  1. colon

  2. rumen

  3. caecum

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

Horses are hindgut fermenters, meaning their primary site of cellulose fermentation and nutrient absorption is the large intestine, particularly the colon. Unlike ruminants, horses rely on microbial fermentation in the cecum and colon, with the colon serving as the main absorptive surface for the resulting nutrients.

Multiple choice

Iliocaecal valve in rabbit is present in

  1. duodenum

  2. sacculus rotundus

  3. small intestine

  4. ileum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The distal end of small intestine (ileum) in rabbit is dilated into a small bulb-like sacculus rotundus which leads into the colon of large intestine. The sacculus rotundus has an iliocaecal valve which directs the chyme from ileum only into caecum, and from caecum into the colon.

Multiple choice

Which of the following is not a component of digestive system in human beings?

  1. Lever

  2. Kidney

  3. Pancreas

  4. Small intestine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kidney is part of the excretory/urinary system, not the digestive system. It filters blood and produces urine, whereas the digestive system (including liver, pancreas, and small intestine) breaks down and absorbs nutrients from food. The question correctly identifies kidney as the non-digestive component.

Multiple choice

Digestive bag is the other name for _________.

  1. ribosome

  2. centrosome

  3. protein

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

Lysosomes contain digestive enzymes that break down waste materials, cellular debris, and foreign invaders - hence called digestive bags or suicide bags. Ribosomes (A) synthesize proteins, centrosomes (B) organize microtubules, and protein (C) is what's digested, not the digester - making all distractors incorrect.