With the help of a neat diagram explain structure and functions of human digestive system.
Human digestive system:
Several organs make up the digestive system. Every organ has a role in breaking down food and managing the waste material.
The digestive organs, in the order in which food travels through them, are:
Mouth: Digestion starts at the very beginning, with food being chewed in the mouth.
Food is broken down into smaller pieces and the saliva in the mouth begins digesting it. An enzyme in saliva called amylase breaks down certain starches down into the smaller sugars.
Esophagus: The esophagus is a tube inside the throat, behind the windpipe.
After food is chewed and swallowed, it travels down through the esophagus to the stomach. The muscles in the esophagus contract to move food along, which is called peristalsis.
Stomach: After the food is deposited in the stomach, the digestive process continues.
The food is mixed with the acids and enzymes that are secreted from the stomach wall. After the food is thoroughly broken down, it's moved along into the small intestine.
Small Intestine: The small intestine is a long tube where most of the vitamins and nutrients are absorbed from food into the bloodstream.
More enzymes are added into the small intestine as the food moves through to help facilitate the process. The small intestine is composed of three parts:
- Duodenum
- Jejunum
- Ileum
Large Intestine: After moving through the small intestine, the food is now partially digested and mostly in a liquid form as it passes through a sphincter called the ileocecal valve and enters the large intestine.
The large intestine is where much of the water is absorbed from the waste material. By the time the stool reaches the end of the large intestine, it's in a more solid form. The sections of the large intestine are called:
- Cecum
- Colon
Rectum: At the end of the large intestine is the rectum, a reservoir that holds stool until it can be passed out of the body.
Anus:
From anus the stool will be egested out.
Human digestive system:
Several organs make up the digestive system. Every organ has a role in breaking down food and managing the waste material.
The digestive organs, in the order in which food travels through them, are:
Mouth: Digestion starts at the very beginning, with food being chewed in the mouth.
Food is broken down into smaller pieces and the saliva in the mouth begins digesting it. An enzyme in saliva called amylase breaks down certain starches down into the smaller sugars.
Esophagus: The esophagus is a tube inside the throat, behind the windpipe.
After food is chewed and swallowed, it travels down through the esophagus to the stomach. The muscles in the esophagus contract to move food along, which is called peristalsis.
Stomach: After the food is deposited in the stomach, the digestive process continues.
The food is mixed with the acids and enzymes that are secreted from the stomach wall. After the food is thoroughly broken down, it's moved along into the small intestine.
Small Intestine: The small intestine is a long tube where most of the vitamins and nutrients are absorbed from food into the bloodstream.
More enzymes are added into the small intestine as the food moves through to help facilitate the process. The small intestine is composed of three parts:
- Duodenum
- Jejunum
- Ileum
Large Intestine: After moving through the small intestine, the food is now partially digested and mostly in a liquid form as it passes through a sphincter called the ileocecal valve and enters the large intestine.
The large intestine is where much of the water is absorbed from the waste material. By the time the stool reaches the end of the large intestine, it's in a more solid form. The sections of the large intestine are called:
- Cecum
- Colon
Rectum: At the end of the large intestine is the rectum, a reservoir that holds stool until it can be passed out of the body.
Anus:
From anus the stool will be egested out.
