Permanent teeth: The second set that replaces milk teeth is termed as permanent teeth. They may last throughout life or fall off during old age.
Ingestion: The process of taking in food into the body is called ingestion.
Digestion: The process of breaking down of food into simpler forms is called digestion.
Absorption: Taking up of the soluble products of digestion into the body's cell is called absorption.
Assimilation: Using the absorbed material is called assimilation.
Egestion: The process of eliminating the undigested food is called egestion.
Villi: Finger-like projections that increase the surface area of the lining of the small intestine and make absorption more efficient are called villi.
Ruminant: A plant-eating animal that brings back swallowed food into the mouth to chew it again is called a ruminant.
Rumen: The first and the largest part of the ruminant stomach is called the rumen.
Amino acid: A class of organic compound and basic unit of proteins.
Amoeba: A shapeless unicellular or single celled organism.
Pseudopodia: Finger-like projections thrown out of the Amoeba's body are called pseudopodia.
Food vacuole: A membrane-enclosed cell vacuole with a digestive function in unicellular organism like Amoeba.
Bile (gall): It is a bitter, greenish-yellow alkaline fluid secreted by the liver. It is stored in the gall bladder.
Buccal cavity: It is the cavity present between the jaws and the cheeks.
Salivary glands: Glands that secrete saliva in the mouth.
Saliva: The watery fluid, secreted into the mouth by the salivary glands, that functions in the tasting, chewing, etc.
Canine: It is one of the four pointed teeth of the jaws.
Cellulose: The substance which constitutes the essential part of the solid framework of plants. It is a type of carbohydrate.
Fatty acid: An acid obtained by the breakdown of fats during the process of digestion.
Glycerol: A colourless liquid obtained by the breakdown of fats.
Gall bladder: It is a muscular sac attached to the liver that secretes bile and stores it until needed for digestion.
Incisor: A tooth for cutting or gnawing; located in the front of the mouth in both jaws.
Liver: A reddish brown gland situated in the upper part of the abdomen on the right side.
Milk teeth: The first set of teeth which grow during infancy and fall off at the age between six to eight years are termed as milk teeth.
Molar: A tooth having a broad biting surface adapted for grinding.
Oesophagus: It is a foodpipe which runs along the neck and the chest.
Pancreas: A large cream coloured gland located just below the stomach.
Premolar: A tooth having two points; located between the incisors and the molars.
Rumination: The process of chewing the cud in ruminants.
