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

The lumen of the GI tract is lined with what tissue layer?

  1. Mucosa

  2. Submucosa

  3. Muscularis externa

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

The mucosa is the innermost layer of the gastrointestinal tract that lines the lumen. It consists of an epithelial lining, a lamina propria, and a thin layer of smooth muscle.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The undigested, semisolid food is called 

  1. Anus

  2. Faeces

  3. Rectum

  4. Villi
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The human digestive system consists of a long muscular tube and several accessory organs such as the salivary glands, pancreas and gall bladder.
  •  It is responsible for food ingestion and digestion, absorption of digestion products and the elimination of undigested materials. 
  • Undigested semi-solid food remaining in the large intestine is called faeces which are eliminated through the anus.
Hence, The undigested, semisolid food is called faeces.
So, the correct answer is 'faeces'.
Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The longest part of the alimentary canal is 

  1. Oesophagus

  2. Large intestine

  3. Small intestine

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

  • The alimentary canal includes the mouth, pharynx, oesophagus, stomach, small intestine, large intestine, and anus.
  • The longest part of the alimentary canal is small intestine because it is the main organ of absorption and digestion of food. 
  • The surface area of the small intestine gets increased because of the presence of villi which gives food plenty of time to break down properly. Hence, the longest part of the alimentary canal is a small intestine.  
So, the correct answer is 'Small intestine'.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Stomach secretes

  1. Dilute hydrochloric acid

  2. Dilute sulphuric acid

  3. Dilute citric acid

  4. Dilute nitric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Parietal cells in the stomach contain an extensive secretory network from which the dilute hydrochloric acid is secreted into the lumen of the stomach.
  •  This dilute Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then helps digestion by breaking the bonds linking amino acids, a process known as proteolysis. Hence, Stomach secretes Dilute hydrochloric acid'
So, the correct answer is 'Dilute hydrochloric acid'.
Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Bile is secreted by 

  1. Stomach

  2. Small intestine

  3. Pancreas

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

  • Bile  is a dark green to yellowish brown fluid, produced by the liver of most vertebrates, that helps in the digestion of lipids in the small intestine.
  •  In humans, bile is produced continuously by the liver, and stored and concentrated in the gallbladder. Hence, Bile is secreted by the liver.
So, the correct answer is 'liver'.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The inner layer of the stomach releases

  1. Water

  2. Blood

  3. Minerals

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

  • The stomach is made of  4 layers. They are serosa, muscularis, submucosa, mucosa. These layers of smooth muscle consist of the outer longitudinal, the middle circular, and the inner oblique muscles.
  • The innermost layer or lining (mucosa) contains the glands that release digestive juices which includes pepsin, chymotrypsin, hydrochloric acid etc. Hence, The inner layer of the stomach releases digestive juices.
So, the correct answer is 'digestive juices'.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The stomach takes part in

  1. Breaking food mechanically

  2. Partially digesting the food

  3. Disinfecting the food

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

The stomach performs multiple functions: mechanical digestion through churning, partial chemical digestion of proteins, and disinfecting food using hydrochloric acid.

Multiple choice evs food trends types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Our stomach is located 

  1. In the head

  2. In the left side of the body

  3. In the right side of the body

  4. Below the abdomen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The stomach is a muscular organ located on the left side of the upper abdomen. 
  • The stomach receives food from the oesophagus.
  •  As food reaches the end of the oesophagus, it enters the stomach through a muscular valve called the lower oesophagal sphincter.
  •  The stomach secretes acid and enzymes that digest food. Hence, our stomach is located on the left side of the body.
So, the correct answer is 'on the left side of the body'.
Multiple choice evs food trends types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

In which animal both intracellular and intercellular digestion occurs

  1. Hydra

  2. Earthworm

  3. Nematode

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

Hydra is a cnidarian that exhibits both intracellular digestion (within food vacuoles of gastrodermal cells) and extracellular digestion (within the gastrovascular cavity). Other options like earthworms and nematodes primarily rely on extracellular digestion within a complete digestive tract.

Multiple choice evs food trends types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Choose the correct answer from the allternatives given.
Which part of the digestive system secretes peritrophic membrane around the food in cockroach?

  1. Crop

  2. Gizzard

  3. Hepatic caecae

  4. Mesenteron
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer C: Hepatic Caecae

The digestive juices flow into the stomach owing to the caecae secretion. The midgut is lined by a peritrophic membrane and not by a cuticle or cuticle.

Multiple choice bio-chemistry from tasting to digestion types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Which of the following break down the food into the simpler form that the body can use?

  1. Digestive juice

  2. Teeth

  3. Water

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The digestive juices consist of saliva, gastric juice, pancreatic juice, intestinal juice and bile. They help in break down of complex food into simpler building block components that can easily be absorbed by the body. These reactions occur outside the cells lining the gut.

So the correct answer is 'Digestive juice'.

Multiple choice bio-chemistry from tasting to digestion types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Most digestion and all absorption of food take place in the :-

  1. small intestine

  2. large intestine

  3. stomach

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

Pepsin is the chief digestive enzyme in the stomach that stomach that breaks down proteins. Cells produce pepsinogen that is produced to act on mucus by epithelial cells of the stomach that helps to protect the lining of the stomach from corrosive hydrochloric acid and pepsin. And the absorption is done in small intestine.

So, the correct option is 'small intestine'.

Multiple choice bio-chemistry digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The process of taking in food from the environment is called 

  1. Ingestion

  2. Digestion

  3. Assimilation

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

  • Ingestion is the consumption of a substance by an organism.
  •  In animals, it normally accomplished by taking in the substance through the mouth into the gastrointestinal tract, such as through eating or drinking. 
  • In single-celled organisms, ingestion can take place by taking the substance through the cell membrane. Hence, The process of taking in food from the environment is called ingestion.
So, the correct answer is 'ingestion'.