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 parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Partially digested semisolid food formed in stomach is ...........

  1. Chyle

  2. Chyme

  3. Bolus

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

Chyme is the name given to the partially digested food, formed in the stomach and enters into the small intestine(duodenum) via the pyloric valve. Chyme, also known as chymus has the consistency of oatmeal(semisolid). Chyme is a thick semisolid mass of partially digested food and digestive secretions during the digestion process. Hence, partially digested semisolid food in the stomach is chyme.

So, the correct answer is 'Chyme'.

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Pepsin digests .............. .

  1. Proteins in stomach

  2. Carbohydrates in duodenum

  3. Proteins in duodenum

  4. Carbohydrates in stomach
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pepsin is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food. Zymogenic cell or peptic cell is a cell in the stomach that releases pepsinogen and chymosin.

The proenzyme pepsinogen(inactive), on exposure to hydrochloric acid, gets converted to the active enzyme pepsin. Pepsin hydrolyses proteins to polypeptide chains and initiates protein digestion in the digestion process in humans. Hence, the pepsin digests protein in the stomach.

So, the correct option is 'proteins in the stomach'.

 

Multiple choice biology constitutes of diet role of vitamins functions and principal sources of vitamins and minerals digestive disorders need for nutrients

Consider the following statements:
(I) The pellagra vitamin is nicotinamide present in milk, yeast, meat and leafy vegetables.
(II) Crypts of Lieberkuhn are present in the liver.
(III) Steapsin is the pancreatic amylase.

  1. I and II are correct.

  2. II and III are correct.

  3. I and III are incorrect.

  4. I and II are incorrect.

  5. I, II and III incorrect.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nicotinamide or Niacin is also known as anti pellagra vitamin. It is a component of NADP, NADP+ and is important for energy transfer reactions. Yeast, pulses, green vegetables, cereals, milk, egg yolk, liver, milk, fish, meat are rich sources of niacin. Crypts of lieberkuhn occur throughout small intestine and produce intestinal juice or succus entericus. Steapsin is pancreatic lipase and acts on fats and converts fats into fatty acids, glycerol, mono and diglycerides.

Multiple choice biology constitutes of diet role of vitamins functions and principal sources of vitamins and minerals digestive disorders need for nutrients

Which of the following are absorbed in the alimentary canal?

  1. Albumin of egg

  2. Polysaccharides

  3. Fat soluble vitamins

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

Monoglycerides and fatty acids enter absorptive cells in the small intestine through micelles; they leave micelles and recombine into chylomicrons, which then enter the bloodstream. Fat soluble vitamins are absorbed in the same manner as lipids; water soluble vitamins can be directly absorbed into the bloodstream from the intestine.

Multiple choice biology constitutes of diet role of vitamins functions and principal sources of vitamins and minerals digestive disorders need for nutrients

Which of the following statements is not correct?

  1. Amino acids are a product of the digestion of proteins

  2. Vegetable fats contain enough vitamin A and D

  3. Pepsin is produced in the glands in the lining of the stomach

  4. Vitamin C is most plentiful in citrus fruits
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The end product of protein digestion is amino acids.
  • The most common source of Vitamin C is citrus fruits.
  • The stomach mucosa’s epithelial lining consists only of surface mucous cells, which secrete a protective coat of alkaline mucus. A vast number of gastric pits dot the surface of the epithelium, giving it the appearance of a well-used pincushion, and mark the entry to each gastric gland, which secretes a complex digestive fluid referred to as gastric juice. Chief cells—Located primarily in the basal regions of gastric glands are chief cells, which secrete pepsinogen, the inactive proenzyme form of pepsin. HCl is necessary for the conversion of pepsinogen to pepsin.
  • Fish oil contains enough vitamin A and D.

So, the correct answer is 'Vegetable fats contain enough vitamin A and D'.

Multiple choice chemistry introduction to acid and base neutralisations in everyday life acids and bases in daily life neutralisation reaction

Indigestion is painful so to relieve indigestion, we take an antacid such as milk of magnesia , which 
contains :

  1. magnesium hydroxide

  2. hydrochloric acid

  3. tartaric acid

  4. calcium hydroxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Milk of magnesia (also known as magnesium hydroxide; $ { Mg }{ (OH) } _{ 2 } $) is basic in nature and one of the most important ingredients of an antacid. 


The hydroxide ions from $ { Mg }{ (OH) } _{ 2 } $) undergo neutralisation with $ { H }Cl $ in the stomach produced during indigestion or gastric problems, to produce water. Equation is as follows :

$ \quad 2HCl\quad +\quad Mg{ (OH) } _{ 2 }\quad \rightarrow \quad Mg{ (Cl) } _{ 2 }\quad +\quad 2{ H } _{ 2 }O $


Hence the option A is correct.

Multiple choice biology the nervous system the reflex action reflex action and reflex arc basic reflex action and reflex arc

Pavlov's pouch is

  1. An artificial stomach

  2. A bag containing digestive enzymes

  3. A bag containing food

  4. Opened stomach of a dog
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Pavlov's Pouch is an artificially created pouch for experimental purposes.
  • It was surgically created by a physiologist Ivan Petrovich Pavlov.
  • It was created to study the physiology of the digestive tract.
  • It was also used to study the principles of secretion of the fundal glands.
  • It is a small portion of the stomach which is separated from the main stomach of a dog.
  • So, the correct answer is 'Opened stomach of a dog'.
Multiple choice zoology excretion and osmoregulation micturition urine and urine formation urine formation

After having lunch or dinner one can feel to pass urine, because of the

  1. Stomach pressures on bladder

  2. Solids become liquids

  3. Water content in food material

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

The feeling to pass urine after a meal is often associated with the increased fluid intake from food and beverages, which increases the volume of urine produced.

Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

The main cause of acidity in the stomach is :

  1. release of extra gastric acids which decrease the pH level

  2. indigestion and pain in large intestine

  3. increase the pH level in stomach

  4. release of extra bile juice which increases alkaline medium in stomach
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An antacid is a substance which neutralises stomach acidity and is used to relieve heartburn, indigestion or an upset stomach.

Antacids contain alkaline ions that chemically neutralise stomach gastric acid, reducing damage and relieving pain.
Gastric acid is a digestive fluid formed in the stomach and is composed of hydrochloric acid ($HCl$), potassium chloride ($KCl$) and sodium chloride ($NaCl$). If gastric acid is released in the stomach the Ph level decreases and thereby increasing acidity in the stomach.

Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

________ work by counteracting (neutralising) the acid in your stomach. 

  1. Disinfectants

  2. Antibiotics

  3. Antacids

  4. Anti-depressants
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Antacids neutralize the acid made by your stomach, curing various problems like heartburn, upset stomach, etc. Generally, they do not have any side effects.

Multiple choice evs excretion in living organisms other systems in the body excretory system in human human excretory organs

The process of expelling waste from the organism is called

  1. Digestion

  2. Ingestion

  3. Excretion

  4. Reflex action
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The process of expelling waste from the organism is called excretion. Ammonia, urea and uric acid are the major forms of nitrogenous wastes excreted by the animals. Ammonia is the most toxic form and requires a large amount of water for its elimination, whereas uric acid, being the least toxic, can be removed with a minimum loss of water.
  • The human excretory system consists of a pair of kidneys, ureter, urinary bladder and urethra.
  • So, the correct answer is 'Excretion'.