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
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protein in alkaline medium in stomach
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protein in acidic medium in duodenum
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protein in acidic medium in stomach
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protein in alkaline medium in duodenum
C
Correct answer
Explanation
Pepsin differs from trypsin in such a way that it digests protein in acidic medium in stomach.
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blood
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bile
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pancreatic juice
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saliva
B
Correct answer
Explanation
Bilirubin and biliverdin are found in bile. Bilirubin is created by the activity of biliverdin reductase on biliverdin, a green tetrapyrrolic bile pigment that is also a product of heme catabolism. Bilirubin, when oxidized, reverts to become biliverdin once again.
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digestive enzymes only
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hormones
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acids only
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no enzymes
D
Correct answer
Explanation
Liver does not secrete any enzymes.It secretes bile that it produces every day from the conversion of broken down hemoglobin.
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liver
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stomach
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duodenum
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pancreas
C
Correct answer
Explanation
Emulsification of fats by bile takes place in the duodenum. It is the breaking up of fat globules into much smaller emulsion droplets.
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HCl acid is too dilute
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the epithelial cells are resistant to the action of HCl acid
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HCl is neutralised by alkaline gastric juice
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the epithelial cells are covered with a mucous secretion
D
Correct answer
Explanation
The epithelial cells lining the stomach of vertebrates are protected from damage by HCl because the epithelial cells are covered with a mucous secretion.
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blood
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bile
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pancreatic juice
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saliva
B
Correct answer
Explanation
Bilirubin and biliverdin are found in bile. Bilirubin is created by the activity of biliverdin reductase on biliverdin, a green tetrapyrrolic bile pigment that is also a product of heme catabolism. Bilirubin, when oxidized, reverts to become biliverdin once again.
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Large intestine
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Stomach
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Food pipe
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Tongue
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Rectum
B
Correct answer
Explanation
Stomach has digestive juice.
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Stomach
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Liver
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Small intestine
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Pancreas
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Food pipe
E
Correct answer
Explanation
Food pipe is also called oesophagus.
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Lipase
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Pepsin
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Salivary amylase
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Rennin
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Trypsin
C
Correct answer
Explanation
Salivary amylase (or ptyalin) in our saliva helps to digest starch into simple sugars.
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rumen
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reticulum
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omasum
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abomasum
D
Correct answer
Explanation
The abomasum is the “true” stomach, secreting HCl and proteases. The microorganisms are killed by the HCl, digested by the proteases and passed on to the small intestine for further digestion.
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omasum
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rumen
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reticulum
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abomasum
A
Correct answer
Explanation
Camel and deer lack omasum.
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pepsin, lipase and rennin
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trypsin, lipase and rennin
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trypsin, pepsin and lipase
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trypsin, pepsin and rennin
A
Correct answer
Explanation
Gastric juice contains pepsin, lipase and rennin.
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Rennin
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Chymotrypsin
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Carboxypeptidase
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Enteropeptidase
D
Correct answer
Explanation
Trypsinogen is activated by an enzyme called enterokinase or enteropeptidase, which is produced by cells lining the duodenum.
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gastrin
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secretin
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cholecystokinin
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enterogastrone
C
Correct answer
Explanation
Contraction of gall bladder in men is due to the secretion of cholecystokinin.
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enterokinase
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secretin
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gastrin
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pepsin
C
Correct answer
Explanation
The hormone which stimulates the gastric glands in stomach is gastrin.