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 biology chemical coordination and integration kidney hormones coordination in human beings- chemical control endocrine system in humans

Renin is produced by 

  1. Liver

  2. Spleen

  3. Juxtaglomerular cells

  4. Stomach
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Liver is the organ of digestive system that secretes bile juice.
B. Spleen is a organ of immune system which produces blood cells.
C. Juxtaglomerular cells are granular cells of kidneys which produce renin enzyme. 
D. Stomach is the part of digestive system that stores food and secrete gastric juices.
So, the correct answer is 'Juxtaglomerular cells'.
Multiple choice biology chemical coordination and integration kidney hormones coordination in human beings- chemical control endocrine system in humans

Chymase is a

  1. Rennin

  2. Activator of prorennin

  3. Activator of chymotrypsinogen

  4. Gastric juice
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Chymase is a chymotrypsin-like serine protease found in the mast cells and also present in basophil granulocytes.
  • Chymase hydrolyzes chymotryptic substrates by activating chymotrypsinogen.
  • So, the correct answer is 'Activator of chymotrypsinogen'.
Multiple choice zoology respiratory system experiments on photosynthesis cellular respiration introduction to respiration

Useful energy is provided to living beings by the process of 

  1. Digestion

  2. Respiration

  3. Regulation

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

Respiration is the process in which nutrients are converted into useful energy in a cell. It is responsible in transporting oxygen and carbon dioxide between cells and the external environment.

Multiple choice biology control and coordination in living organisms feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

Which part of the intestine is connected to the Pancreas?

  1. Jejunum

  2. Ilem

  3. Duodenum

  4. Islets of Langerhans
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Pancreas is about 6 inches long and sits across the back of the abdomen, behind the stomach. The head of the pancreas is on the right side of the abdomen and is connected to the duodenum (the first section of the small intestine) through a small tube called the pancreatic duct.

Multiple choice biology control and coordination in living organisms feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

Which cells of the Pancreas helps in conversion of Glycogen to Glucose?

  1. Alpha Cells

  2. Beta Cells

  3. Gamma Cells

  4. Delta Cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The pancreas releases glucagon, which is produced by Alpha cells of Pancreas, when the concentration of insulin (and indirectly glucose) in the bloodstream falls too low. Glucagon causes the liver to convert stored glycogen into glucose, which is released into the bloodstream.

Multiple choice biology the endocrine system feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

Which illustrates feed back in development

  1. As tissue 'X' develops, it secretes enzyme to inhibit development of tissue 'Y'

  2. As tissue 'X' develops, it secretes something that induces tissue 'Y' to develop

  3. As tissue 'X' develops, it secretes something that slows down growth of tissue 'Y'

  4. Tissue 'X' secretes RNA which changes the development of tissue 'Y'.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The X and Y tissue system is observed in Crustaceans. The X organ produces hormones that control development, to prevent molting during development it releases an antiecdysis hormone, which stops the Y organ from secreting the molting hormone.
Therefore, the correct answer is' As tissue 'X' develops, it secretes enzyme to inhibit development of tissue 'Y'
Multiple choice common health problem international health bodies health organisation biology

Blood in stools + watery constituency of stools is found in a condition known as 

  1. Diarrhoea

  2. Indigestion

  3. Dysentery

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

Dysentery is an intestinal infection that causes severe diarrhoea with blood and mucus may be found in the stool. In diarrhea, Loose, watery stools along with abdominal cramps occur. Other symptoms of dysentery include abdominal cramps or pain, nausea, vomiting, dehydration, and fever.

So the correct answer is 'Dysentery'.

Multiple choice botany strategies for enhancement in food production balanced diet food production and microbes plant breeding for food production

Chemosynthesis is BEST defined as _________________.

  1. Synthesis of food by chemical means

  2. Synthesis of a chemical compound

  3. Synthesis of food with energy obtained in a chemical reaction

  4. Absorption of food material in various parts of the body
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chemosynthesis is the biological conversion of carbon containing compounds and other nutrients into organic matter using the oxidation of inorganic molecules or methane as a source of energy, rather than sunlight. Thus, it is best defined as the synthesis of food with energy obtained in a chemical reaction.

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion

Ammonia formed during digestion is processed in

  1. Liver

  2. Small intestine

  3. Large intestine

  4. Stomach
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • During digestion, the deamination of amino acids results in the production of ammonia (NH3). 
  • However, the liver contains a system of carrier molecules and enzymes which quickly converts the ammonia (and carbon dioxide) into urea
  • This ammonia is an extremely toxic base and its accumulation in the body may cause death.  Hence,  Ammonia is formed during digestion in the liver.
So, the correct answer is 'liver'.
Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

Which one of the following enzyme is absent in invertebrates?

  1. Pepsin

  2. Trypsin

  3. Lipase

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

Protein in invertebrates is a breakdown by four different enzymes known as a proteinase, carboxypolypeptidase, aminopolypeptidase, and dipeptidase, which can be separated by adsorption but vertebrates have one extra enzyme trypsin is also found that helps in activation of the given four and digestion of protein.

So the correct option is 'Trypsin'.

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

What is common among amylase, rennin and trypsin?

  1. These are produced in stomach
  2. These act at a pH lower than $7$

  3. These all are proteins

  4. These all are proteolytic enzymes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Amylase, rennin and trypsin are protein enzymes.

Amylase is enzymes that catalyse the hydrolysis of carbohydrates. Amylase is produced by the pancreas and salivary glands.
Rennin is an enzyme especially produced by stomach for digestion of milk proteins in infants. 
Trypsin is a proteolytic enzyme produced in the small intestine. 
So, the correct option is 'These all are proteins'.

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

Proteins are broken down into amino acids completely in

  1. Buccal cavity

  2. Stomach

  3. Intestine

  4. Rectum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Once a protein source reaches your stomach, hydrochloric acid, and enzymes called proteases to break it down into smaller chains of amino acids. 
  • Amino acids are joined together by peptides, which are broken by proteases.
  • Digestion of protein is completed in the small intestine by the pancreatic enzymes trypsin, chymotrypsin, and carboxypeptidase. Hence, Proteins are broken down into amino acids completely in Intestine. 
So, the correct answer is 'Intestine'.
Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

The three secretions meeting the food in small intestine are

  1. Bile juice, pancreatic juice and intestinal juice

  2. Pancreatic, intestinal and gastric juice

  3. Bile, pancreatic and gastric juice

  4. Bile, gastric juice and saliva
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Various types of movements are generated by the muscularis layer of the small intestine. These movements help in a thorough mixing up of the food with various secretions in the intestine and thereby facilitate digestion. The bile, pancreatic juice and the intestinal juice are the secretions released into the small intestine. Pancreatic juice and bile are released through the hepato-pancreatic duct. The intestinal mucosal epithelium has goblet cells, which secrete mucus. The secretions of the brush border cells of the mucosa along with the secretions of the goblet cells constitute the intestinal juice or succus entericus.

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

Digestion of carbohydrates, proteins and fats completes in

  1. Stomach

  2. Liver

  3. Small intestine

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

Small intestine has three parts - duodenum, jejunum and ileum. When food leaves the stomach through its pyloric end and enters the duodenum it is called chyme (acidic). The digestion of macro molecules ingested is completed in small intestine. The digested products are absorbed in the small intestine and comes to the blood.