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

Bile salts help in

  1. digestion of fats

  2. digestion and absorption of fats

  3. digestion of proteins

  4. digestion of proteins and fats

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

Correct Answer: digestion of fats

Multiple choice

Succus entericus is a/an

  1. intestinal juice

  2. gastric juice

  3. bile juice

  4. salivary juice

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

Correct Answer: intestinal juice

Multiple choice

Flame cells are associated with

  1. respiration

  2. excretion

  3. nutrition

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

A flame cell is a specialized excretory cell found in  flatworms . 

Multiple choice

The amount of bile is released in proportion to the amount of

  1. fat in meal

  2. protein in meal

  3. carbohydrate in meal

  4. All of these

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

Bile is a fluid that is made and released by the liver in proportion to the fat in the meal. It is stored in the gallbladder and helps with the digestion of fats.

Multiple choice

Humans cannot digest cellulose whereas cows can do so because

  1. cows' gut contains certain bacteria capable of digesting cellulose

  2. cows have a many-chambered stomach

  3. cows have efficient molars for grinding

  4. cows produce acids which can digest cellulose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct Answer: cows' gut contains certain bacteria capable of digesting cellulose

Multiple choice

What is the process of removal of faecal matter known as?

  1. Ingestion

  2. Egestion

  3. Assimilation

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

Faecal matter is the waste material left after digestion of food, which needs to be removed out of the body. This process is known as egestion. Ingestion refers to the intake of food, assimilation to the use of digested food and digestion to the breakdown of complex food.

Multiple choice

Secretion of gastric juice is controlled by

  1. gastrin

  2. cholecystokinin

  3. enterogastrin

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gastrin is a peptide hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility. It is released by G-cells in the pyloric antrum of the stomach, duodenum and the pancreas.

Multiple choice

Most of the lysosomal enzymes function at

  1. acidic pH

  2. basic pH

  3. neutral pH

  4. any pH

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

All the lysosomal enzymes are acid hydrolases, which are active at the acidic pH (about 5) that is maintained within lysosomes.