Table of contents |
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What is Animal Nutrition? |
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Different Ways of Taking Food |
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Digestion in Humans |
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Digestion in Grass-eating Animals |
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Feeding and Digestion in Amoeba |
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Animal nutrition is the study of how animals obtain and utilize nutrients from their food.
Digestion in Humans
Modes of Food Intake: Different organisms have unique ways of taking in food, depending on their body structure and surroundings. Here are some examples:
Various modes of feeding
To better understand the variety of feeding methods in animals, observe and categorize the type of food and feeding modes of different animals. Below is a table with examples:
Various Modes of FeedingModes of Feeding Explained:
Note:
- Starfish feed on animals with hard calcium carbonate shells.
- It opens the shell and extends its stomach out through its mouth.
- The soft animal inside the shell is then eaten.
- After feeding, the stomach retracts, and digestion occurs inside the body.
Star Fish
Food is taken in through the mouth, digested, utilized, and unused parts are excreted. It passes through a long canal or digestive tract called alimentary canal which starts at the buccal cavity and ends at the anus.
The canal divided into various compartments:
Human Digestive System
Digestive Process:
The process of food intake, known as ingestion, begins in the mouth.
Arrangement of teeth
The food pipe, also known as the Oesophagus, is where swallowed food travels into the stomach. The food pipe is located along the neck and the chest.
Movement of food in Oesophagus
The stomach is a thick-walled organ shaped like a flattened J and is the widest part of the alimentary canal.
Stomach
The small intestine is approximately 7.5 meters long and highly coiled. It receives secretions from the liver, pancreas, and its own walls.
Small & Large Intestine
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After food is digested, it moves into the blood vessels lining the intestine through a process known as absorption.
Villi
The large Intestine absorbs water and certain salts from undigested food material.
Large Intestine
Grass-eating animals, such as cows and buffaloes, chew continuously even when not actively eating. This helps them break down the fibrous material in grass.
Digestive system of ruminant
Cellulose Digestion:
Other Digestive Structures:
Small Organisms and Digestion:
Diarrhea
Amoeba is a tiny single-celled organism discovered in pond water. Characteristics of Amoeba include a cell membrane, a dense nucleus, and multiple small vacuoles within its cytoplasm.
Amoeba
Digestion in Amoeba
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1. What is animal nutrition and why is it important? | ![]() |
2. What are the different ways animals take in food? | ![]() |
3. How does digestion occur in humans? | ![]() |
4. What is the process of digestion in grass-eating animals? | ![]() |
5. How does feeding and digestion occur in amoeba? | ![]() |