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 digestion and absorption assimilation of food and egestion assimilation of food components and importance of food

Which of the following is an intestinal disorder?

  1. Gastrointestinal stromal tumors

  2. Cystic fibrosis

  3. Peptic ulcers

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A) Gastrointestinal stromal tumors are most accurately found in the stomach or intestine but can be found in any part of the digestive tract and can be malignant or benign.

B) Cystic fibrosis is the genetic disorder that affects mucus, sweat and digestive glands majorly affect the lungs and digestive tract especially stomach and small intestine.
C) The peptic ulcer is the sores on the lining of the duodenum of the intestine and known as a duodenal ulcer.
So, the correct option is 'All of the above'

Multiple choice biology digestive system of human digestive system - organs process of digestion coordination in the process of digestion

Consider the following statement regarding human.
a. Duodenum is the longest part of small intestine
b. Hepatic and cystic ducts release their secretions into common bile duct whose opening is controlled by sphincter of Oddi
c. Ileocaecal valve is present at the junction of small intestine and large intestine
d. Mechanical digestion and chemical digestion of food occurs in buccal cavity, stomach and small intestine 
Which of the following choices is correct?

  1. A and B only

  2. B and C only

  3. C and D only

  4. A, B, C and D
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
a. Ileum is the longest part of small intestine.
b. Bile duct and pancreatic duct open together into the duodenum as the common hepato-pancreatic duct which is guarded by a sphincter called the sphincter of oddi.
c. Ileocaecal valve is present at the junction of small intestine and large intestine.
d. Mechanical digestion and chemical digestion of food occurs in buccal cavity, stomach and small intestine.
a and b are wrong. c and d are correct.
So, the correct answer is 'C and D only'
Multiple choice bio-chemistry digestive system of human digestive system - organs process of digestion coordination in the process of digestion

What is the process of food passage from buccal cavity to the side of water and mineral absorption?

  1. Mouth $\rightarrow$ Buccal cavity $\rightarrow$ Pharynx $\rightarrow$ Oesophagus $\rightarrow$ Duodenum $\rightarrow$Stomach $\rightarrow$ Ileum $\rightarrow$ large intestine
  2. Mouth $\rightarrow$ Buccal cavity $\rightarrow$ Pharynx $\rightarrow$ Oesophagus $\rightarrow$ Stomach $\rightarrow$Duodenum $\rightarrow$ Ileum $\rightarrow$ Caecum $\rightarrow$Rectum
  3. Mouth $\rightarrow$Buccal cavity $\rightarrow$ pharynx $\rightarrow$ Larynx $\rightarrow$ Stomach $\rightarrow$ Small intestine $\rightarrow$Large intestine
  4. Mouth $\rightarrow$ Buccal cavity $\rightarrow$ Pharynx $\rightarrow$ Food $\rightarrow$ pipe $\rightarrow$ Stomach
    $\rightarrow$ Large intestine $\rightarrow$ Small intestine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct anatomical sequence for the digestive tract is Mouth, Buccal cavity, Pharynx, Oesophagus, Stomach, Small intestine (Duodenum, Jejunum, Ileum), and Large intestine.

Multiple choice bio-chemistry digestive system of human digestive system - organs process of digestion coordination in the process of digestion

Which ones are absorbed in the alimentary canal without any breakdown?

  1. Proteins

  2. Polysaccharides

  3. Fat soluble vitamins

  4. Albumen of egg
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fat-soluble vitamins (A, D, E, K) are absorbed directly into the bloodstream or lymphatic system without needing chemical breakdown by digestive enzymes.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Digestion of starch starts in the stomach.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Digestion of starch starts from the mouth. The salivary gland in the mouth secretes saliva, which mixes with the food that is chewed. This is because to moisten the food. The saliva in the mouth contains the enzyme called amylase that is the starch-digesting enzyme.

So, the correct answer is option B.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

J-shaped muscular bag that churns the food is 

  1. Small intestine

  2. Stomach

  3. Large intestine

  4. Oesophagus

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stomach: It is a muscular J- shaped thickly walled bag. Stomach churns the food to mix digestive juices. The food in the stomach is churned into semi-solid. The churned semi-solid food is called chime.

So, the correct answer is 'Stomach'.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

A muscular structure that regulates the opening of the oesophagus into the stomach is known as

  1. Epiglottis

  2. Lower esophagus sphincter

  3. Pyloric sphincter

  4. Sphincter of Oddi
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. The epiglottis is a leaf-shaped cartilaginous flap located behind the tongue. It prevents the entry of food in the windpipe by sealing off the windpipe while eating the food.
B. Lower oesophagus sphincter, also known as a cardiac orifice, is the opening of the oesophagus into the stomach. It regulates the opening of the oesophagus into the stomach.
C. Pyloric sphincter is found between the duodenum and posterior stomach. It regulates the opening of the duodenum into the stomach.
D. Sphincter of Oddi is the opening of the hepatopancreatic duct into the duodenum.
So, the correct answer is 'Lower oesophagus sphincter'.
Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

The most distensible portion of the alimentary  canal is ________.

  1. Oesophagus

  2. Stomach

  3. Large intestine

  4. small intestine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The oesophagus is a hollow distensible muscular part of the alimentary canal.
  • The ability to stretch and expand is called distensibility.
  • The distensibility of the oesophagus allows any kind of food to pass through it with ease.
  • The oesophagus dilates and propels the food from the region of the pharynx to the stomach.
  • The stomach is a J shaped distensible bag like structure and is a highly distensible part of the alimentary canal.
  • It may take varying shapes and can hold about 1 litre of food.
  • The gastric folds in the inner walls of the stomach allow it to get expanded.
  • So, the correct answer is 'Stomach'.
Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

The upper part of stomach is called ____ stomach. 

  1. fundic

  2. pyloric

  3. cardiac

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The fundus is the upper, rounded part of the stomach, located above the level of the cardiac orifice. The cardiac part is where the esophagus enters, and the pyloric part is the lower section leading to the duodenum.