Question

Explain the process of digestion in humans​

Answer 1

Answer:

The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The process of digestion has three stages. The first stage is the cephalic phase of digestion which begins with gastric secretions in response to the sight and smell of food. This stage includes the mechanical breakdown of food by chewing, and the chemical breakdown by digestive enzymes, that takes place in the mouth.

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Answer 2

Explanation:

Humans have holozoic nutrition, that means the food is consumed as a whole and the digestion occurs internally. It can be described as:

INGESTION - The food is taken in the oral cavity in the process called the ingestion. The teeth help in grinding of the food, salivary amylase helps in partial breakdown of the starch and the tongue helps in mixing the food with saliva and helps in swallowing it.

DIGESTION- The process of break-down of complex substances into simpler substances is called digestion and it starts with the mouth where physical break-down occurs along with some chemical digestion. The ingested food is swallowed in and it arrives in stomach where the digestion of proteins occurs due to presence of the enzyme pepsin. Then next,it moves into the small intestine where rest of the process of digestion will be completed. The pancreatic juice, the intestinal juice and the bile will result in breakdown of carbohydrates, fats and the rest of the proteins. Next it moves to the large intestine where the water is absorbed.

ABSORPTION- The digested food is absorbed via the finger-like projections present on the inner surface of the small-intestine and the reach the blood stream.

ASSIMILATION- The absorbed food is then used by different tissues for the energy generation. The excess food is stored under the skin and acts as energy reserves.

EXCRETION- The undigested material passes from the small-intestine to the rectum of the large-intestine, from where it is removed from the body through anus.

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