Alimentary Canal
Alimentary Canal
Alimentary Canal:
In human beings, the digestive system constitutes a long tubular structure called the alimentary canal which is about 7 - 8 metres long. It extends from the mouth to the anus. The complete process of ingestion, digestion, absorption, assimilation and egestion of food material is done within the alimentary canal itself. The alimentary canal can be divided into various components. Starting from mouth to anus, different parts of the canal can be written as :
1. Mouth : It is the starting point of our digestive tract. Food is ingested through mouth. About 30 % of carbohydrates get digested in the mouth. The mouth is filled with watery substance named as saliva. Saliva is consists of mucus, water and enzymes etc.
2. Oral Cavity : The oral cavity is consists of palate, tongue and teeth. Palate is the roof of the oral cavity. Tongue is the muscular and gladular structure attached to the base of the oral cavity.
3. Teeth are used for the mechanical churning of food. A tooth is white enamel below which dentine is present. Human are diphyodont i.e. they have two sets of teeth - milk or deciduous and permanent teeth. These are of four types incisors. canines, premolars and molars. In Humans, teeth are embedded in the sockets called as gums.
4. Pharynx : It is the common passage for food and air. Epiglottis prevents the entry of food into the windpipe.
5. Oesophagus : It is the muscular tube through which small bolus of food passes from the mouth to the stomach. The Gastro oesophageal sphinchter controls the movement of food into the stomach.
6. Stomach : It is a muscular bag, positioned at the upper left part of the abdominal cavity. It has four parts : cardiac,fundus, body and pyloric portion.
7. Small intestine : It is the longest part of the alimentary canal and comprises three parts - Duodenum, Jejunum and Ileum. It is the main site of digestion of food material.
8. Large Intestine :The small intestine leads into the large intestine. Rectum is the end point of large intestine.
9. Anus : It is the end point of alimentary canal. The undigested food get excreted out of the body through anus.
Alimentary canal is about ___________ meters long . | |||
| Right Option : C | |||
| View Explanation | |||
Longest part of the alimentary canal is ______________ | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) Mouth is the starting point of our digestive tract. Food is ingested through mouth. About 30 % of carbohydrates get digested in the mouth. (b) Small intestine is the longest part of the alimentary canal and comprises three parts - Duodenum, Jejunum and Ileum. (c) Large intestine The small intestine leads into the large intestine. Rectum is the Ned point of large intestine.. | |||
| Right Option : D | |||
| View Explanation | |||
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