Mention the name's of glands and organs which help in digestion
Answers
Answer:
Explanation:
♠What is the function of digestive System?
→ The digestive system is responsible for breaking down the the complex food materials into simpler and absorbable form , So that they can be utilized by our body and easily absorbed by blood to be transported at different body parts.
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The Human Digestive System mainly consists of two parts →
♦ Alimentary Canal
♦ Associated Digestive Glands.
The Alimentary Canal and Associated Digestive Glands are as follows →
♦ The mouth →
The mouth is first part of Alimentary Canal. It opens into a large Buccal cavity. It's function is to receive food to start digestion. The partial digestion of food also takes place in mouth as saliva produced in the mouth digests starch , and the food gets masticated along with the mixing of saliva and then it is called bollus and hence partial digestion of food completes.
The mouth contains following parts →
♦ Cheeks and lips → They are highly sensitive and help in detecting degree of hotness and texture of food.
♦ Tongue → It is a thick muscular organ which has taste buds and it gives us sensation of taste and is covered by Mucous membrane.
♦ Palate → The palate is in form of roof of mouth cavity and has anterior hard and posterior soft palate.
♦ Teeth → We have two jaws , upper jaw and lower jaw and which bear teeth , Teeth help us to chew the food. ( One interesting fact about lower jaw- It is the only movable joint in our skull)
Salivary Gland →
There are three pair of salivary Gland in Human Beings →
♦ The parotid gland → They secrete a clear , watery fluid rich in amylase.
♦ The sub-mandibular Gland → They secrete a more viscous liquid.
♦ The sublingual glands → They secrete saliva that is thick and stringy.
♦ Next Comes the Pharnyx →
Pharnyx is an area at the back of throat that connects buccal cavity with oesophagus. The Larynx or the voice box is present at the entrance of the wind pipe is pulled upward to regulate the movement of food into the oesophagus.
♦ Next part is Oesophagus →
It is a tube like structure 25cm in length , extending from Pharnyx to stomach. Food passes from Oesophagus by peristalsis.
♦Next part is Stomach →
The Oesophagus opens into the stomach , Stomach is a J-shaped muscular bag like structure place above the diaphragm on left of abdomen, It receives and mixed food with Digestive juices, and propels food into small intestine. It is divided into cardiac , fundic and pyloric regions. The opening of intestine into stomach is called pylorus.
♦ Pancreas → The pancreas produces pancreatic juice that aids in digestion . The pancreas is associated closely to the Small intestine.
♦ Liver → Liver is the largest gland in Human body and weights about 1.5 kg in adult human beings. Liver secrets Bile juice , which emulsifies the fat and creates an alkaline medium essential for activity of pancreatic enzymes.
♦ Small intestine →
The small intestine is longest tube of Alimentary Canal (about 7m long) . It is coiled and folded in abdomen.
It is divided into three parts →
♦ Duodenum →
It is shortest and most fixed portion of Small intestine. It is a C shaped structure.
♦ Jejunum→
It remains empty , it is about two metres long.
♦ ileum →
It is a twisted tube and it's length is about 4 metres.
♦ Villi → Villi are tiny hair like projections on the inner wall of Small intestine. They increase the surface area of absorption very large ( nearly 8 times of outer body surface)
♦ Large Intestine →
It absorbs water and electrolytes and forms and stores faeces. It has three parts →
♦ The caecum → The small blind pouch at the junction of small and large intestine.
♦ The Colon → It is about 1m long and broader than ileum , It absorbs the water.
♦ The rectum → The last part of large intestine (about 15cm long) It opens outside through Anus.