Question

Describe the Alimentary canal in human being?

Answer 1

☞Question:

Describe the Alimentary canal in human being ?

☞Answer:

Mammalian (human) alimentary canal comprises mouth, buccal cavity, pharynx, oesophagus, stomach, small intestine , large intestine and anus.

The mouth, bounded by two lips open into oral cavity.

➺Buccal cavity :

It contains teeth, tongue, and receives saliva from 3 pairs of salivary glands. Teeth are meant for cutting and mastication of food.

➺Pharynx :

It is a vertical tube. It is a cross passage for food and air. It has uvula and epiglottis which closes the internal nares and glottis respectively during swallowing of food to ensure the passage of food into oesophagus (food pipe).

➺Oesophagus :

It is a 25cm long narrow muscular straight tube. It opens into stomach. Oesophagus propels the swallowed food into stomach.

➺Stomach:

It is a sac-like structure situated in the upper part of abdominal cavity below the diaphragm. Large part of this sac is situated left of the median line.

➺Small Intestine:

It is the longest part of the alimentary canal. It is thin walled and highly coiled tubular structure. It is about 3-3.5 meters long and occupies most part of abdominal cavity. It is coiled upon itself. Its inner lining is thrown into numerous villi.

➺Large Intestine:

The large intestine is about 1.5 meters long. It is divided into following parts, i.e. the vermiform appendix, the colon and the rectum. Caecum is a blind tube and represented by vermiform appendix (5 - 8 cm) and is present below the junction of small and large intestine. Rectum is the last part and opens to the outside by anus guarded by anal sphincter.