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 bio-chemistry immunity and blood groups active and passive immunity acquired immunity innate and acquired immunity

What are the chemicals secreted by damaged mast cell of connective tissue?

  1. Pepsin and renin

  2. Lysozyme and somatostatin

  3. Melanin and coherin

  4. Histamine and heparin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • A mast cell is a resident cell of connective tissue that contains many granules rich in histamine and heparin.
  • Mast cells are allergy cells responsible for immediate allergic reactions. They cause allergic symptoms by releasing Histamine and heparin.
  • Hence the chemicals secreted by damaged mast cell of connective tissue are Histamine and heparin.
  • So, the correct answer is 'Histamine and heparin'.
Multiple choice biology aids to health immunization, treatment and antibiotics antibodies and antitoxin prevention and treatment of disease

Which of the following systems in man is affected by the bite of cobra?

  1. Digestive

  2. Nervous

  3. Excretory

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

The venom of cobra consists primarily of neurotoxins (affects the nervous system) with several other compounds. They are capable of delivering a fatal bite. These block the transmission of the nerve impulse by the sensory and motor neurons. So, the correct answer is option B.

Multiple choice zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

Which of the following statements is correct?

  1. Argentaffin cells produce serotonin

  2. Villikinin is secreted by large intestine

  3. In cheilosis, deficient nutrient is nicotinamide

  4. Bleeding disease occurs due to deficiency of vitamin E
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Argentaffin cells (also known as enterochromaffin cells) are specialized cells in the gastrointestinal tract that produce serotonin.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Mucosal living of which organ differ from others in concern with number of layer of cell (simple/strtified)?

  1. Stomach

  2. Small intestine

  3. PCT

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

The proximal convoluted tubule(PCT) of the nephron in the kidney has microvilli. Thus, it has 2 mucosal linings whereas rest others have only one mucosal lining. So, the correct answer is 'PCT'.

Multiple choice evs nutritious food minerals and vitamins nutrition and diet role of various nutrients

In the complete absence of which the duodenal digestion of chime proteins not possible 

  1. Enterokinase

  2. Dil HCl

  3. Gastrin

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

Enterokinase is the enzyme that activates trypsinogen into trypsin. Without trypsin, other pancreatic proteases cannot be activated, making protein digestion in the duodenum impossible.

Multiple choice evs nutritious food minerals and vitamins nutrition and diet role of various nutrients

Chilomicrons are

  1. Small fat globules coated with protein

  2. Protein molecules coated with fat

  3. Small granules found in gastric juice

  4. Aerobic microbes

  5. Neural signals that stimulate intestinal secretions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chylomicrons are lipoprotein particles that consist of triglycerides, phospholipids, cholesterol, and proteins. They transport dietary lipids from the intestines to other locations in the body.

Multiple choice evs nutritious food minerals and vitamins nutrition and diet role of various nutrients

Humans cannot digest cellulose whereas cows can do so because

  1. Their gut contains certain bacteria capable of digesting cellulose.

  2. They have a many-chambered stomach.

  3. They have efficient grinding molars.

  4. They produce an enzyme cellulase which can digest cellulose.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Humans lack the enzyme necessary to digest cellulose. Hay and grasses are particularly abundant in cellulose, and both are indigestible by humans (although humans can digest starch). Animals such as termites and herbivores such as cows, koalas and horses all digest cellulose, but even these animals do not themselves have an enzyme that digests this material. Instead, these animals harbour microbes that can digest cellulose. Animals such as cows have anaerobic bacteria in their digestive tracts which digest cellulose. Cows are ruminants. Ruminants have several stomachs that break down plant materials with the help of enzymes and bacteria. The partially digested material is then regurgitated into the mouth, which is then chewed to break the material down even further. The bacterial digestion of cellulose by bacteria in the stomachs of ruminants is anaerobic, meaning that the process does not use oxygen. 

Multiple choice evs nutritious food minerals and vitamins nutrition and diet role of various nutrients

The part of food that is not digested in the body is

  1. Starch

  2. Cellulose

  3. Proteins

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

The digestive system of Humans has many enzymes, and acids to break down and digest all kinds of different foods (carbohydrates. proteins and fats), but do not have the enzymes needed to break down cellulose. Cows, Goats, Sheep and other animals that graze on many organic foods(For example, grass) do have the enzymes needed to break down cellulose. Hence The part of food that is not digested in the body is Cellulose because the cellulose-digesting enzyme is absent.

So, the correct answer is 'cellulose'.

Multiple choice biology food for health fats fats and their test different nutrients in food

Bile salts take part in

  1. Digestion of carbohydrates

  2. Breakdown of proteins

  3. Emulsification of fat

  4. Absorption of glycerol
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bile salts are essential for the emulsification of fats, which breaks large fat globules into smaller droplets to increase the surface area for lipase enzymes to act upon.

Multiple choice biology food for health fats fats and their test different nutrients in food

Lacteals take part in.

  1. Secretion of lactic acid

  2. Formation of milk

  3. Absorption of milk

  4. Absorption of fat
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lacteals are specialized lymphatic capillaries located in the villi of the small intestine that absorb dietary fats (chylomicrons) that are too large to enter the blood capillaries directly.