Science, asked by askiprakshmitasmi, 1 year ago

Explain the process of digestion in human beings.

Answers

Answered by susu1
340
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). In this system, the process of digestion has many stages, the first of which starts in the mouth (oral cavity). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The secretion of saliva helps to produce a bolus which can be swallowed to pass down the oesophagus and into the stomach.

Saliva also contains a catalytic enzyme called amylase which starts to act on food in the mouth. Another digestive enzyme called lingual lipase is secreted by some of the lingual papillae on the tongue and also from serous glands in the main salivary glands. Digestion is helped by the mastication of food by the teeth and also by the muscular actions of peristalsis and segmentation contractions. Gastric juice in the stomach is essential for the continuation of digestion as is the production of mucus in the stomach.

Peristalsis is the rhythmic contraction of muscles that begins in the oesophagus and continues along the wall of the stomach and the rest of the gastrointestinal tract. This initially results in the production of chyme which when fully broken down in the small intestine is absorbed as chyle into the lymphatic system. Most of the digestion of food takes place in the small intestine. Water and some minerals are reabsorbed back into the blood in the colon of the large intestine. The waste products of digestion (faeces) are defecated from the anus via the rectum.
Answered by vilnius
172

The process of digestion in human beings.

Explanation:

  • Digestion is the process that involves breaking the food in small and simpler forms.
  • The nutrients are absorbed by the body.
  • The process of digestion initiates with the chewing of the food in the mouth. Enzymes are secreted in the mouth to help in the chewing and swallowing of the food.
  • When the food reaches the stomach, many gastric juices are secreted. The food is then broken into simpler forms.
  • The nutrients are absorbed by the body and the wastes then undergo the process of excretion for their removal.

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