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

When a woman takes dairy products she complains of diarrhoea and stomach aches. She does not complains when she consumes food other than the dairy products. She is suffering with deficiency of which of these enzymes?

  1. Renin

  2. Lactase

  3. Lipase

  4. Trypsin

  5. Ptyalin
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Any of a group of enzymes found in the small intestine, liver, and kidney of mammals that catalyze the breakdown of lactose (milk sugar) into the simple sugars.

Multiple choice

Hastate plate is present in which part of the alimentry canal?

  1. Cardiac stomach

  2. Pyloric stomach

  3. Fundic stomach

  4. Ileum

  5. Rectum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The anterior end of the stomach is situated near the diaphragm,  which is right beneath the heart and that is the reason why it is branded as the Cardiac Stomach. Hastate plate makes the mid-ventral floor of cardiac stomach.

Multiple choice

Inside the gastrointestinal tract, the dead cells are replaced by

  1. absorptive cells

  2. goblet cells

  3. stem cells

  4. Parietal cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stem cells are specialised cells which are capable of cell division to replace dead cells. In the gastrointestinal tract, these cells are essential to replenish the surface epithelium.

Multiple choice

Bile is secreted by __________.

  1. gall bladder

  2. liver

  3. bile duct

  4. pancreas

  5. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bile is a bitter tasting, dark green to yellowish brown fluid produced by the liver of most vertebrates. It is secreted by the liver, stored in the gallbladder and discharged into the duodenum. It is a composition of water, bile salts, mucus and pigments, fats, inorganic salts and cholesterol.

Multiple choice

Which of the following is not a function of HCl in stomach?

  1. It kills bacteria.

  2. It detoxifies food.

  3. It makes the medium acidic.

  4. It converts pepsinogen to its inactive form pepsin.

  5. It maintains the pH almost 2.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is given wrong as it is the opposite. It actives pepsinogen to its active form pepsin.

Multiple choice

Which is not a part of the digestive system?

  1. Liver

  2. Heart

  3. Stomach

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

The heart is part of the circulatory system, not the digestive system. The digestive system includes the mouth, stomach, liver (which produces bile), intestines, and other organs that process food. The heart pumps blood and has no direct role in digestion.

Multiple choice

Which of following processes is not a part of nutrition?

  1. Digestion

  2. Absorption

  3. Ingestion

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

Nutrition involves processes that provide nutrients to the body: ingestion (taking in food), digestion (breaking down food), absorption (taking nutrients into blood), and assimilation (using nutrients). Excretion removes waste products and is not part of the nutrition process.

Multiple choice

Which of the following organs does not secrete digestive juices?

  1. Liver

  2. Small intestine

  3. Oesophagus

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

The liver produces bile, small intestine produces intestinal enzymes, and stomach produces gastric juices. The oesophagus is a muscular tube that only transports food via peristalsis - it does not secrete any digestive juices.