Class 7 Nutrition in Animals Notes for exams

Class 7 Nutrition in Animals Notes for exams. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

NUTRITION IN HUMANS

• The alimentary canal and the associated glands together constitute the digestive system.

• Food is taken into the mouth through the mouth. This process of taking food into the body is called ingestion.

What happens to the food in different parts of the digestive tract?

The mouth :

Our mouth has the salivary glands which secrete saliva. The saliva breaks down the starch into sugars.

Oesophagus –

• It is a long, narrow, muscular tube which directly leads to the stomach.

• It is about 25 cm long and passes downwards through the neck, the thorax and the abdominal cavity.

• Oesophagus gently pushes masticated food down to the stomach in a wave - like action, called peristalsis.

The stomach:

• The inner lining of the stomach secretes mucous, hydrochloric acid and

• digestive juices.

• The mucous protects the lining of the stomach by neutralizing acid produced by gastric juice.

• Later the cud returns to the mouth in small lumps and the animal chews it. This process is called rumination.

•The cellulose present in grass is digested here by the action of certain bacteria which are not present in humans.

DIGESTION IN AMOEBA:

Amoeba is a single-celled organism found in pond water. It has a cell membrane, a dense, rounded nucleus and many bubble-like vacuoles. Amoeba constantly changes its shape and position. It pushes out one or more finger like projections, called pseudopodia or false feet for movement and capturing of food. Amoeba feeds on microscopic organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food becomes trapped in a food vacuole and digested by the digestive juices.

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