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
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Stomach
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Liver
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Kidneys
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Heart
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aldolase
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triose phosphate isomerase
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trypsin
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cellulase
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alliinase
E
Correct answer
Explanation
Alliinase is responsible for catalysing chemical reactions that produce the volatile chemicals that give odours and tear-inducing properties.
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ligninase
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lactonase
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ecarin
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mucunain
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expansin
C
Correct answer
Explanation
Ecarin is derived from the venom of the Indian saw-scaled viper.
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trypsinogen
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chymotrypsinogen
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sterol esterase
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phospholipase D
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pancreatic lipase
C
Correct answer
Explanation
This enzyme participates in bile acid biosynthesis.
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lactase
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motilin
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gastric inhibitory peptide
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cholecystokinin
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secretin
A
Correct answer
Explanation
This is a significant brush border enzyme.
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Gastric Lipase
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Gastrin
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Mucin
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Intrinsic factor
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Pepsin
C
Correct answer
Explanation
The stomach has a priority to destroy the bacteria and viruses using its highly acidic environment.
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lactase
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β-galactosidase
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chitinase
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sucrase
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amylases
D
Correct answer
Explanation
The levels increase in pregnancy/lactation and diabetes.
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Acidity
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Allergy
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Constipation
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Abscess
A
Correct answer
Explanation
Acidity occurs when the stomach produces more acid than is needed for digestion. This often leads to discomfort or heartburn.
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Acid secreted by stomach reaching the heart
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Acid contents going back up into the esophagus
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pH of digestive juices getting further lowered due to intake of acidic foods
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Overproduction of acids in the stomach
B
Correct answer
Explanation
Correct Answer: Acid contents going back up into the esophagus
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Process of digestion in herbivores is slower than in carnivores.
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Herbivores do curdling of food.
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Cellulose takes longer time than meat to get digested.
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Herbivores secrete less efficient enzymes.
C
Correct answer
Explanation
Herbivores mainly consume cellulose which is a complex saccharide. It takes longer time to get digested. Meat is comparatively easily digested. Thus, carnivores have smaller intestine.
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digestion of food
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absorption of food
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assimilation of food
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propulsion of food
B
Correct answer
Explanation
Small intestine is specially designed with finger-like projections called villi for absorption of food. Villi increase the surface area and thus, increase the efficiency of absorption.
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gall bladder
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liver
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pancreas
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intestine
A
Correct answer
Explanation
Bile required for the digestion of fats is stored in the gall bladder.
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Amylase
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Pepsin
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Trypsin
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Bile
D
Correct answer
Explanation
Bile is probably absent in his digestive tract. Fats are passing out undigested as is evident from the greasy stool. Bilirubin is not getting excreted. Thus, the stool is white.
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It is liquid in nature.
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It consists of partly digested food.
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It is expelled to the stomach.
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It is acidic in nature.
C
Correct answer
Explanation
It is untrue. Chyme is expelled to the duodenum from the stomach.
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Amylase
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Lactase
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Lipase
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Protease
B
Correct answer
Explanation
Inability to digest milk sugar is known as lactose intolerance, which is caused by lactase deficiency. This enzyme helps in the digestion of lactose.