Explain the human digestive system.
Answers
Explanation:
Digestive System Process:
From the Mouth to the Large Intestine and Anus. The Human digestive system process can be divided into stages, namely:
Ingestion
Motility
Secretion
Digestion
Absorption
Excretion
The whole process starts in the oral cavity, where the saliva from the salivary glands mixes with the food and starts to begin the breakdown of food. From the mouth, the food passes to the hollow tube-like organ the esophagus. From the esophagus, food then travels to the stomach, where it breaks down further with the help of the acids and powerful enzymes secreted by the stomach.
This semi-digested food then travels down to the small intestine, where secretions from the liver, gallbladder, and pancreas further act on the food particles. The small intestine is divided into three parts called the duodenum, jejunum, and ileum. Most of the digestion takes place here in the small intestine, where absorption also occurs. Once most of the absorption of water and digested nutrients is completed in the small intestine, the remaining waste products move to the large intestine. The large intestine divides into appendix, caecum, colon, and rectum. The faecal matter from the large intestine comes out through the anus.
Digestive System Parts:
Mouth
The anterior opening of the alimentary canal is the mouth. It leads to a buccal cavity or oral cavity, where teeth, tongue and salivary glands are present. Here, ingestion, mastication, and swallowing of food occur. In humans, there are a total of 32 permanent teeth. There are four different types of teeth, namely, incisors, canines, premolars, and molars. These help in the chewing of food.
Human digestive system organs
(Source: Wikipedia)
Salivary Glands
They are exocrine glands that produce saliva in the oral cavity. They secrete an enzyme called amylase, which helps in the breakdown of starch into maltose. There are three types of salivary glands, namely:
Parotid gland
Submandibular gland
Sublingual gland
Stomach
The esophagus leads to a sac-like organ called the stomach. It is a muscular, hollow organ, having a capacity of 1 litre. The stomach holds food and also is a mixer and grinder. It secretes strong acids and powerful enzymes that help in the process of breaking down of food. Food is generally in a liquid or pastes consistency when it leaves the stomach.
human digestive system organ
(Source: Wikipedia)
Small Intestine
The small intestine is a long tube, which loosely coils in the abdomen area. Here, enzymes from the pancreas and liver further break down the food. Three segments make up the small intestines, which are the duodenum, jejunum, and ileum. The contractions of the small intestine help in the movement of food, along with its breakdown, after mixing with the digestive secretions. The jejunum and ileum areas of the small intestine are responsible for the absorption of food into the blood, though their villi.
Pancreas, Liver and Gall Bladder
These organs also play a significant role in the human digestive system. The pancreas secretes enzymes which help in the breakdown protein, fat, and carbohydrate. The liver secretes bile and cleanses and purifies the blood coming from the small intestine. The gallbladder stores the bile that the liver produces. It releases bile into the small intestine to aid in the digestion process.
Large Intestine
The large intestine is a long muscular tube that has different parts, which are caecum, colon, and rectum. The waste that is left over after digestion of food, reaches the rectum through the peristaltic movements of the colon.
Digestive System Controls
Hormones and nerves control the human digestive system. The walls of the alimentary canal have many sensors which regulate the digestive functions. Even hormones are involved in the digestion process. The main digestive hormone, gastrin is secreted in response to the presence of food. Gastrin again stimulates the gastric acid secretion. All these regulate the digestion process.
Answer:
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This is your answer
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion. Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body.
The six primary processes of the digestive system include:
Ingestion of food.
Secretion of fluids and digestive enzymes.
Mixing and movement of food and wastes through the body.
Digestion of food into smaller pieces.
Absorption of nutrients.
Excretion of wastes
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