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Human Digestive System (Worksheets, Parts of the Digestive System, and Diagram)

Grade 7 Science Worksheets

The human digestive system is a complex network of organs and processes responsible for breaking down food, absorbing nutrients, and eliminating waste. It starts with the mouth, where food is chewed and mixed with saliva, then moves through the esophagus to the stomach, where it is further broken down. The small intestine is where most digestion and nutrient absorption occur, with the help of the liver and pancreas. The large intestine absorbs water and electrolytes, forming waste that is stored in the rectum and eliminated through the anus. Throughout this process, muscles, hormones, nerves, and enzymes work together to facilitate digestion and maintain bodily functions.

The Digestive System is one of the vital systems of all living beings. The food we eat gets converted to the much needed energy only due to our digestive system. All the organs of this system work in perfect synchronization to ensure that maximum nutrition is extracted from this food and passed on to our Circulatory System.

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What are the organs of the digestive system? | Human Digestive System Worksheets

Organs of the Human Digestive System

How does food move through the digestive system?

The Digestive system is also called alimentary canal and it is supported by organs like teeth, tongue, liver, and others. The digestive system helps to convert food into energy and nutrients to nourish the body. The food we take in is thoroughly digested and absorbed by our body and the wastes are eliminated through the excretory system. The alimentary canal is a lengthy tube through which the food goes down to our system. It starts at the mouth or the oral cavity going through the pharynxesophagus or food pipestomachsmall intestineslarge intestinesrectum andanus. The food particles get digested in every stage of the alimentary canal as they move.

Oral /Mouth and the Buccal Cavity

The mouth has many accessory organs such as the tongue, teeth, and salivary glands, which help in the digestion of food. Food starts the first step of digestion in the mouth, also known as the buccal cavity or the oral cavity. Food is grinded by the teeth. Salivary amylase is the digestive juices given off by the salivary glands. This moistens the food, and break the food down into usable and absorbable components and then the food is pushed down into the pharynx. 

digestive system diagram for class 7


The pharynx acts as a passage for the chewed food from the mouth to the esophagus. It has a flap of tissue known as the epiglottis preventing the food from getting into the wind pipe and helps us from getting choked while we eat.

Esophagus or Food Pipe

The esophagus is a tube joining the pharynx to the stomach. It is made of flexible muscle to help pushing of food easily. It carries swallowed food down its long tube and pushes it to the stomach.


The stomach is a thick-wall made of muscle in the form of a bag that is located on the left side of the abdominal cavity. It is the largest part of our digestive system. Stomach acts as a storage place for food. And slowly digests food. It gets food from the food pipe and sends it to the small intestine. The stomach has digestive acids which help reduce food into further absorbable substances. Mucous protects the inner walls of the stomach. This can otherwise get damaged while digesting food. Because the acid reacts with the bacteria and kills it that enters our body with food. The digestive enzymes break down proteins into simpler substances.

Small Intestine

The small intestine is just named small. But it is the longest part our digestive system. It is made in such a way that it is highly coiled; it’s quite thin tubular form but still about 7.5 meters long. (The length of the small intestine depends on the diet of the organism.) A major proportion of digestion takes place in the small intestines. Nutrients get digested here. The walls of the small intestine also secrete juices for digesting food. The enzymes in the intestine convert the carbohydrates into glucose, proteins to amino acids and fats into fatty acids and glycerol.


The liver releases bile. This neutralizes the acidity level of the food. The pancreatic juice digests the proteins and lipids. Once the food is broken down into the simple particles, it is ready to be absorbed by the body.  The absorbed food is then carried to different parts of the body through the blood vessels for cell activities.

Large Intestine

The large intestine is a thicker tube than the small intestine. The large intestine absorbs water and left over nutrients from the remaining food with the help of many bacteria in it. The remaining food waste passes into the rectum, where it is ready to get out as semi-solid wastes. Feces then are excreted by the body through the anus.

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Sample Questions

Q1. Identify organs involved in digestion –

A. I deliver food to stomach by means of series of muscular contractions called ‘Peristalsis’.____________
B. I act as a hollow container that holds food and secrete HCL.____________
C. I am the largest gland in the body and helps in bile secretion.____________
D. I am responsible to produce a watery secretion that helps to moisten food and begins the digestion of carbohydrates.____________
E. I am a long muscular tube and helps in absorption of food. I have millions of VILLI that increase the food absorption area._____________

Q2. Define these terms –

A. Digestion :__________________________________________________
B. Absorption :_________________________________________________
C. Bile Juice:__________________________________________________
D. Mechanical Digestion :__________________________________________
E. Peristalsis :__________________________________________________

Check Point

I. Fill in the blanks –

  1. The ……………………..……………is the long tube through which the food that we eat is passed.
  2. The flap of tissue known as the ……………… present in pharynx prevents food from entering into the wide pipe.
  3. The enzymes in the intestine convert the ………………. into glucose, proteins to …………….. and fats into fatty acids and glycerol.
  4. The liver releases ………. juice which neutralizes the acidic food received from the stomach and also converts the fat.
  5. The ……………… ……… digests the proteins and lipids.

II. State True or False –

  1. The digestive system of is a system of organs working together to eliminate waste products out of the body.
  2. The esophagus is a tube joining the pharynx to the stomach made of flexible muscle to ease pushing of food.
  3. Mucous protects the lining of the stomach while acid kills bacteria that enter the body along with the food.
  4. The small intestine is the smallest part of the human digestive system.
  5. A major proportion of digestion takes place in the large intestines.
Answer Key

I. Fill in the blanks –

  1. Alimentary canal
  2. Epiglottis
  3. Carbohydrates , Amino acids
  4. Bile
  5. Pancreatic juice

II. State True or False –

  1. False
  2. True
  3. True
  4. False
  5. False
What is the primary function of the digestive system?

The digestive system’s main function is to break down food, extract nutrients, and eliminate waste from the body.

How long does digestion typically take?

The duration of digestion varies depending on factors such as the type of food consumed, individual metabolism, and overall health. Generally, it takes around 24 to 72 hours for food to pass through the entire digestive system.

What role does stomach acid play in digestion?

Stomach acid, primarily composed of hydrochloric acid, helps break down food, kill bacteria, and activate digestive enzymes. It creates an acidic environment that aids in the breakdown of proteins and promotes optimal digestion.

What are the essential organs involved in digestion?

The major organs involved in digestion are the mouth, esophagus, stomach, small intestine, large intestine (colon), liver, pancreas, and rectum. Each organ performs specific functions to ensure effective digestion and nutrient absorption.

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