Biology · Science General

Human Digestive System

1,953 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 digestive system of human role of intestine digestion in intestine digestive system - organs

Argentaffin cells occur in

  1. Large intestine

  2. Stomach

  3. Small intestine

  4. Both B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Argentaffin cells (also known as enterochromaffin cells) are specialized endocrine cells found throughout the gastrointestinal tract, including the stomach, small intestine, and large intestine. Given the options, the large intestine is a correct site, though they are present in other areas too.

Multiple choice bio-chemistry digestive system of human role of intestine digestion in intestine digestive system - organs

Read the following statements and select the correct option.


Statement 1 : The worm-like structure attached to the caecum at the beginning of the large intestine is known as vermiform appendix.
Statement 2 : Vermiform appendix has no apparent digestive function. 

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 1 accurately describes the anatomical location and appearance of the vermiform appendix. Statement 2 is also correct, as the appendix is considered a vestigial organ with no significant digestive function in humans.

Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

$HCl$ is present in which of the following things?

  1. Gastric juices of mammals

  2. Volcanic emissions
  3. Both $A$ and $B$

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$HCl$ is present in free state in volcanic emissions and it is also available in gastric juices of mammals and helps in digestion process.
Hence option C is correct.

Multiple choice evs nutrition and its deficiency general functions of food nutrition and its need in plants nutrition and its need

Nutrition includes

  1. Food intake

  2. Absorption

  3. Assimilation

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

Nutrition is the science that interprets the interaction of nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an organism. It includes food intake, absorption, assimilation, biosynthesis, catabolism and excretion. 

Multiple choice evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

Diapedesis means.

  1. Movement of the food in gut

  2. Formation of W.B.C.

  3. The process by which leucocytes squeeze through thin capillary wall

  4. Formation of R.B.C.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diapedesis is the specific physiological process where white blood cells, particularly neutrophils, migrate through the endothelial walls of capillaries to reach sites of infection or tissue damage.

Multiple choice zoology control and coordination in living organisms pineal gland pituitary gland and pineal gland pineal gland and thymus

Serotonin is secreted from

  1. $\alpha $- cells
  2. $\beta $- cells
  3. $\delta $- cells

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

Serotonin is the hormone that contributes the feeling of well being and happiness in animals including humans. It is basically derived from tryptophan and is located in the gastrointestinal tract (GI tract), blood platelets and central nervous system. 90% of the total serotonin is primarily located in GI tract in Enterochromaffin cells and used for regulation of intestinal movements. Hence, answer D is correct.

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

Which one produces serotonin hormone in pancreas?

  1. $\alpha$-cells
  2. $\beta$-cells
  3. $\delta$-cells
  4. $\gamma$-cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the pancreas, the delta cells (or D-cells) are known to produce somatostatin, but in certain contexts or specific literature, they are associated with serotonin production as well.

Multiple choice zoology locomotion and movement contractile protein structure of muscle muscles and their structure

Select the option where the property describing muscle fibres is not associated with wall of stomach.

  1. Presence of actin and myosin fibrils

  2. Branched, multinucleated appearance

  3. Presence of cell junctions

  4. Involuntary nature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The layers of stomach wall include serosa, muscularis, submucosa, and mucosa these are involuntary in nature and show the presence of cell junctions also, the muscularis layer shows branched and multinucleated appearance.

However, the presence of actin and myosin fibrils is seen in smooth muscles.
So, the correct answer is 'Presence of actin and myosin fibrils'.

Multiple choice biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

During period of starvation, the following organ is most likely to decrease in size? 

  1. Brain

  2. Heart

  3. Thymus

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

During severe starvation, lymphoid organs like the thymus undergo extensive involution and decrease significantly in size as immune cell production slows down and resources are conserved. Vital organs such as the brain and heart are strictly protected and maintained nearly constant in size.

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

Rennin acts on milk protein and changes

  1. Caesinogen into casein

  2. Caesin into paracaesin

  3. Caesinogen into paracaesin

  4. Paracaesin into caesinogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rennin is an enzyme secreted in the stomach that acts on the milk protein caseinogen and converts it into insoluble paracasein, which is subsequently precipitated by calcium ions to form curd. This is a key step in infant milk digestion.

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.