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

Which of the following options is not a part of the small intestine?

  1. Ileum

  2. Jejunum

  3. Duodenum

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

Small intestine is divided into 3 parts; Duodenum, where secretion of liver and pancreas are poured in; Jejunum, where intestinal juice completely digests all food particles; and Ileum, where digested food is absorbed into the blood. Colon is a part of the large intestine. Hence, (4) is the answer.

Multiple choice

The white part of the faecal matter dropped by lizards and birds consists of

  1. urea

  2. ammonia

  3. uric acid

  4. bile salts
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ammonia, urea and uric acid are the excretory products in different animals. Ammonia is an excretory product in gaseous form in fishes. On the other hand, uric acid (white in colour) is in birds, lizards, snakes etc. Urea is an excretory product in the human beings.

Multiple choice

Villi present on the inner lining of the intestinal wall

  1. secretes enzymes for digestion

  2. secretes hormones

  3. decreases the surface area for absorption

  4. increases the surface area for absorption
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The inner lining of the small intestine has numerous finger-like projections called villi, which increase the surface area for absorption. So, option 4 is correct.

Multiple choice

Which of the following is a set of enzymes secreted by pancreas?

  1. Sucrase, maltase, lactase

  2. Pepsin, rennin, trypsin

  3. Trypsin, chymotrypsin, carboxypeptidase

  4. Ptyalin, chymotrypsin, carboxypeptidase

  5. Rennin, sucrase, carboxypeptidase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trypsin, chymotrypsin, carboxypeptidase: All are pancreatic hormones