Biology ยท 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
-
connective tissue
-
nerve tissue
-
epithelial tissue
-
muscle tissue
C
Correct answer
Explanation
It is the simplest tissue and is the protective tissue of the body. The cells of the tissue are tightly packed and it forms a continuous sheet. It covers most of the organs and cavities within the body. It also forms a barrier to keep different body systems separate. The skin and lining of the buccal cavity, blood vessels, alveoli and kidney tubules are made of epithelial tissue. It helps in absorption of water and nutrients
-
muscle tissue
-
epithelial tissue
-
connective tissue
-
nerve tissue
A
Correct answer
Explanation
The muscle tissue form the contractile tissue are made of muscle cells. Movement of body or limbs are brought about by contraction and the relaxation of the contractile proteins which are present in the muscle cells The movement of the internal organs such as heart and alimentary canal, are all caused by muscle tissues
-
acids
-
alkali
-
enzymes
-
vitamins
C
Correct answer
Explanation
Digestion is a biochemical process where complex food molecules are broken down into simpler absorbable forms by the action of enzymes.
-
Liver
-
Thyroid
-
Pancreas
-
Stomach
C
Correct answer
Explanation
Trypsin is a digestive enzyme secreted by the pancreas in an inactive form (trypsinogen) and activated in the small intestine to break down proteins.
-
Enterokinase
-
Streptokinase
-
Urease
-
Fibrinolysins
B
Correct answer
Explanation
Streptokinase is used to dissolve blood clots that have formed in the blood vessels. Streptokinase belongs to a group of medications known as fibrinolytics, and complexes of streptokinase with human plasminogen can hydrolytically activate other unbound plasminogen by activating through bond cleavage to produce plasmin.
A
Correct answer
Explanation
Proteins are complex molecules composed of long chains of amino acids. During digestion, enzymes break these chains down into individual amino acids for absorption.
-
Around 4 hours
-
Around 6 hours
-
Around 12 hours
-
Around 13 hours
-
illeum
-
caecum
-
duodenum
-
rectum
C
Correct answer
Explanation
The duodenum is the first and shortest segment of the small intestine, connecting directly to the stomach.
-
Glucose
-
Amino Acids
-
Fatty acids
-
Alumina acids
D
Correct answer
Explanation
Digestion breaks down food into glucose (from carbohydrates), amino acids (from proteins), fatty acids and glycerol (from fats). 'Alumina acids' is not a recognized biological term or digestion product - it appears to be a made-up or misspelled term.
-
Testosterone
-
Pepsine
-
Insuline
-
Estrogen
C
Correct answer
Explanation
The pancreas secretes insulin, which regulates blood sugar levels, and glucagon. Testosterone is produced by testes, pepsin is a digestive enzyme from stomach, and estrogen is from ovaries. Note: 'Insuline' should be spelled 'Insulin' and 'harmone' should be 'hormone'.
-
hydrochloric acid
-
ptylan
-
mucin
-
pepsin
C
Correct answer
Explanation
Mucin is the mucus secretion that lubricates food in the alimentary canal, helping it move smoothly. Hydrochloric acid digests food, ptyalin (salivary amylase) digests starch, and pepsin digests proteins.
-
Respiratory system
-
Circulatory system
-
Digestive system
-
Excretory system
-
Reproductive system
C
Correct answer
Explanation
This is the correct option. The digestive system includes small intestine. It also includes mouth, stomach, large intestine etc.
-
Peptidases
-
Disaccharidases
-
Amylases
-
Both (1) and (2)
D
Correct answer
Explanation
The epithelial cells of intestinal mucosa manufacture and secrete disaccharidases and peptidases. These enzymes are not released into the lumen of intestine but remain closely associated with the microvilli of the epithelial cells.
-
Proteinase
-
Pectinase
-
Lipase
-
Trypsin
C
Correct answer
Explanation
Lipase from microbes is used to remove stains.