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

Directions: Answer the following question by selecting the most appropriate option.

It has been observed that the process of digestion is faster inside the stomach than outside because

  1. the digestive juices when kept outside the stomach become inactive

  2. food is churned in the stomach thereby increasing the surface area for quicker enzyme action

  3. the digestive juices inside the stomach are acidic, while 'outside they are alkaline

  4. the amount of digestive juices produced in the stomach in the presence of food is much more
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Digestion is faster in the stomach primarily because of mechanical digestion - the churning action breaks food into smaller particles, dramatically increasing surface area for enzyme action. This is why we chew food too. While stomach acidity helps, option B captures the primary mechanical advantage.

Multiple choice

Succus entericus is secreted by

  1. islets of langerhans

  2. gastric glands

  3. uterine crypts

  4. goblet cells

  5. crypts of Lieberkuhn
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

They secrete succus entericus, which is the intestinal juice.

Multiple choice

Where is the pancreatic juice released?

  1. Duodenum

  2. Ileum

  3. Stomach

  4. Jejunum

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

Pancreatic juice is the alkaline secretion of the pancreas, which is released into the duodenum and contains several digestive enzymes.

Multiple choice

In which medium does pepsin become active?

  1. Acidic

  2. Alkaline

  3. Neutral

  4. Isotonic

  5. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pepsin becomes active in acidic medium where the pH remains less than 7. Pepsin is present in the gastric juice and is primarily meant for the digestion of proteins.

Multiple choice

Mammals drink water and also get it from

  1. breakdown of glycogen into glucose

  2. secretion of saliva

  3. oxidation of glucose

  4. conversion of oxyhemoglobin to hemoglobin

  5. digestion of fats
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxidation of glucose releases water and carbon dioxide. This water is utilised in the body and carbon dioxide is released outside through the lungs.

Multiple choice

Ileum is a part of

  1. pelvic girdle

  2. pectoral girdle

  3. large intestine

  4. pancreas

  5. small intestine
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Small intestine is divided into duodenum, ileum and jejunum.