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

Multiple choice biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

Enzyme ptyalin or salivary amylase present in the saliva gets activated by 

  1. Mastication of food

  2. Hydrolysis of food by saliva

  3. Starch present in the food

  4. Chloride ions present in saliva
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chewing or mastication is the process by which food is crushed and ground my teeth. It is the first step of digestion, and it increases the surface area of foods to allow a more efficient break down by enzymes. So the correct option is 'Mastication of food '.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Salivary glands secrete

  1. Amylase

  2. Pepsin

  3. Trypsin

  4. Bile juice
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. Bile juice is secreted by liver. Pepsin and trypsin are produced in small intestine. 

Therefore, the correct answer is option A.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

A digestive enzyme, salivary amylase, in the saliva being digestion of 

  1. Protein

  2. Nucleic acids

  3. Fats

  4. Carbohydrates
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • First, salivary glands in your mouth make salivary amylase, which begins the digestive process by breaking down starch when you chew your food, converting it into maltose, a smaller carbohydrate. 
  • The breakdown of starch is just one of the many steps in the process of digestion. Although digestion begins in the mouth, it continues in the stomach and intestines.
  • Amylase is an enzyme that breaks down starch to sugar. The amylase in the mouth, salivary amylase, is called ptyalin. 
  • Ptyalin can do digestive can work in the stomach for several hours. Iodine and Benedict's solution is used to recognize starch and sugar (maltose) in our saliva.
Therefore, the correct answer is option D.
Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Enzymes of salivary glands, stomach and small intestine works at pH __, __ and ___ respectively.

  1. 6.8, 2, 8

  2. 8,2, 6.8

  3. 2,8,6.8

  4. 6.8, 8,2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Salivary amylase works best at a slightly acidic pH of about 6.8, gastric enzymes (like pepsin) work in a highly acidic environment (pH 1-2), and intestinal enzymes work in an alkaline environment (pH 8).

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Identify the correctly matched structure and its secretion

  1. Brunners glands Salivary amylase

  2. Intestinal mucosa Insulin

  3. Gall bladder Bile

  4. Salivary gland Lysozyme

  5. Goblet cells - HCl
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Salivary glands secrete saliva containing enzymes like salivary amylase and lysozyme, which provides antibacterial protection. Brunner's glands secrete alkaline mucus, not amylase.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Choose the wrong statement among the following

  1. Trypsinogen is activated by enterokinase

  2. Optimum pH for salivary amylase is 8.9

  3. Rennin helps in digestion of milk proteins

  4. Goblet cells secrete mucus

  5. Submucosal glands of intestine are also known as Brunners glands
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salivary amylase has an optimum pH of approximately 6.8. A pH of 8.9 is alkaline and would inhibit the activity of salivary amylase.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Ptyalin enzyme is secreted by

  1. Salivary glands

  2. Mouth

  3. Oesophagus

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

Ptyalin is a form of amylase found in saliva of humans. Another name of ptyalin is salivary amylase. It is the most important amylolytic enzyme secreted in mouth (buccal cavity) by the salivary glands. The main function of ptyalin is to catalyze the hydrolysis of starch into maltose and dextrin. 

Multiple choice zoology excretory system of human disorders of excretory system disorders related to the excretory system functions and disorders of kidney

Stool of a person contain whitish grey colour is due to malfunction of ............... organ.

  1. Pancrease

  2. Spleen

  3. Kidney

  4. Liver
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Normal stools can vary in shades of brown, mostly due to diet.
Bile salts are released into the stools by the liver, giving the stools a brown color. If the liver is not producing enough bile, or if the flow of the bile is blocked and not draining from the liver, the stools will be pale or clay-colored.
Therefore, the correct answer is option D.

Multiple choice evs food components energy from different food components nutritional requirements of the body need for nutrients simple test for nutrients test for nutrients

Which of the following is not directly dependent of a person's protein intake?

  1. Formation of enzymes

  2. Formation of glycogen stored in liver

  3. Production of antibodies in the immune system

  4. Production of muscle tissues
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Considering all the four options we find that Enzymes, Antibodies and Muscle tissue all are made up of amino acids as their basic structural component only the glycogen stored in the liver is made up of monosaccharides as it's structural component. So, protein intake in the person will affect the formation of enzymes, antibodies and muscle tissue but will not affect the Glycogen stores in the Liver.

So, the correct answer to the question is 'Formation of the glycogen store in the liver'. 

Multiple choice zoology animal diversity - ii (phylum: chordata) circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system frog

In frog, the pancreas produces

  1. Two digestive enzymes, one hormone

  2. Three digestive enzymes, one hormone

  3. Three digestive enzymes, two hormones

  4. Three digestive enzymes, three hormones
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In frog, pancreas is made up of lobules, connective tissue and islets of langerhans. The islets of Langerhans secrete a hormone known as insulin. The pancreatic juice contains three enzymes. The trypsin, amylopsin and stoop sin or lipase.