Question

write the process of digestion human

Answer 1

The mouth is the beginning of the digestive tract. In fact,digestion starts here as soon as you take the first bite of a meal. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use. 

The throat is the next destination for food you've eaten. From here, food travels to the esophagus or swallowing tube.

The esophagus is a muscular tube extending from the pharynx to the stomach. By means of a series of contractions, called peristalsis, the esophagus delivers food to the stomach.

The stomach is a sac-like organ with strong muscular walls. In addition to holding the food, it's also a mixer and grinder. The stomach secretes acid and powerful enzymes that continue the process of breaking down the food. When it leaves the stomach, food is the consistency of a liquid or paste. 

From there the food moves to the small intestine. The small intestine continues the process of breaking down food by using enzymes released by the pancreas and bile from the liver. 
There are 3 organs play a pivotal role in helping the stomach and small intestine digest food: Pancreas, Liver and Gallbladder.

Once the nutrients have been absorbed and the leftover liquid has passed through the small intestine, what is left of the food you ate is handed over to the large intestine, or colon. Stool, or waste left over from the digestive process, is passed through the colon by means of peristalsis. It normally takes about 36 hours for stool to get through the colon. The stool itself is mostly food debris and bacteria.

When the descending colon becomes full of stool, or feces, it empties its contents into the rectum to begin the process of elimination. It is the rectum's job to receive stool from the colon. When anything (gas or stool) comes into the rectum, sensors send a message to the brain. The brain then decides if the rectal contents can be released or not. 

The anus is the last part of the digestive tract. The lining of the upper anus is specialized to detect rectal contents. It lets us know whether the contents are liquid, gas, or solid. The pelvic floor muscle creates an angle between the rectum and the anus that stops stool from coming out when it is not supposed to. The internal sphincter keeps us from going to the bathroom when we are asleep, or otherwise unaware of the presence of stool. When we get an urge to go to the bathroom, we rely on our external sphincter to keep the stool in until we can get to the toilet.

Answer 2

Food first of all is start digesting in mouth.
Starch -----maltose
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Then in mouth after mixing up with saliva the food takes a bolus shape.Then it is passed through oesophagus (by peristalsis movement of oesophagus).
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Then from oesophagus food enters into stomach where by HCl , Bile and Gastric juice
Function:-
HCl=>It help in breaking down of ammino acid.
Gastric juice=>Helps in breakdown protein.
Bile=>Breakdown of fat .
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Then from stomach it passes through the small intestine where with the help of villi essential nutrients gets absorbed and emptied ultimately into bloodstream.

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Then waste food is transported into large intestine where only water like things is absorbed.
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Then the food goes into anus where it is excreted out.


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