Small Intestine Essay

989 words - 4 pages

The small intestine is an important organ of the digestive system. It plays an important role in digestion of food as well as assimilation of the nutrients. It is located in the central and lower part of the abdomen, between the stomach and large intestines. When the small intestine is stretched out, it is approximately 7 meters long, making it the largest part of the digestive tract and is approximately 2.5-3 centimeters in diameter. The small intestine should be taken care by a doctor that specializes in gastroenterology, also known as the gastroenterologist.
The small intestine is divided into three main sections: duodenum, jejunum, and ileum (Henry Gray). The duodenum receives the ...view middle of the document...

The main function of the small intestines is to absorb nutrients and minerals from food. The food absorbed enters all the nutrients and minerals into the bloodstream in order to enrich it. The constant functions of the small intestine include: chemical digestion, nutrient absorption, and peristalsis (BBC). Chemical digestion, which occurs in duodenum, involves the enzymes of the pancreatic juice and the bile the small intestine receives to break down the proteins, lipids, carbohydrates, and nucleic acids of the chyme into their respective basic molecules. After the chyme has been broken down, nutrient absorption takes place in the jejunum and ileum. At each villus and microvillus of the jejunum and ileum, the nutrients and minerals from the broken-down chyme diffuse across the membrane into blood capillaries and lymph channels to enter the bloodstream. Lastly, peristalsis controls the movement of chyme throughout the small intestines by using alternating waves of muscle contraction and relaxation of the smooth muscle.
The small intestines also works with other organ systems to carry out its functions and maintain homeostasis. First of all, it indirectly aids the excretory system by carrying the indigestible food in continuation from the stomach to the large intestines that carries the material to the rectum (part of the excretory system). In addition, the small intestines requires help from the muscular system in order to move the chyme through its tract. Since that movement of the muscular system is involuntary, it means that the autonomic nervous system is also aiding the small intestine. Furthermore, the circulatory and lymphatic systems play a role by receiving the nutrients and minerals from the chyme.
The small intestines is a vital organ in the digestive system, and is in charge for the absorption of nutrients and minerals for the body. If it were to stop functioning properly, one would rapidly become malnourished and possibly die, but survival without is possible for a short period of time. Small intestine transplants are possible because a person can...

Find Another Essay On Small Intestine

The digestive system Essay

1074 words - 4 pages extended) extending from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food. This tube also includes the pharynx, esophagus, large intestine, and anus.The digestive system is responsible for converting the food we eat into energy for our bodies to use. In order to use the food we eat, our body has to break the food

The Path of Food and Alcohol

639 words - 3 pages nervous system. The digestion system's job is to break down food into small molecules to be absorbed by villi in the small intestine. Digestion starts when they first took a bite of their nachos and enters the oral cavity. The tongue moves the food around the mouth so teeth can mash it down, while salivary glands secrete saliva to wet the food. It is swallowed down the pharynx and down the esophagus where it then enters the stomach. The stomach

Diversity in Animal Digestive Systems

716 words - 3 pages systems in mammals. The monogastric digestive system (mono=one, gastric=stomach) and the polygastric digestive system (poly=many, gastric=stomach). Pigs and humans are examples of monogastric organism. The digestive tract of monogastric organisms divided on five parts: the mouth, oesophagus stomach, small intestine and large intestine. The mouth is the first stage of digestion and is the place where the chemical break down of food starts. Oesophagus

Digestive System

1628 words - 7 pages consists of the following: mouth, esophagus, stomach, small intestine, pancreas, liver, gallbladder, large intestine, rectum, and anus (slideshare). Types of Digestion There are 2 different types of digestion: chemical digestion and mechanical digestion (slideshare). Mechanical digestion is simply digestion that is achieved through a movement, or mechanism (stek). There are 2 types of this: mastication and peristalsis. The first step of digestion

The Digestive System

777 words - 3 pages introduces the small intestine. The pancreas is about 6 inches long and shaped like a flat pear. (eMedTV, n.d.) The transverse colon is the second half of the large intestine that puts the waste into feces. The small intestine finishes the process of digestion, absorbs the nutrients, and passes the residue onto the large intestine. The descending colon is the last part of the large intestine. The ascending colon absorbs fluids and recycles them into

Digestion of Cheetos

1059 words - 4 pages secretory activity of gastric glands. In the stomach, some salt from the Cheetos is absorbed through the wall. The Cheetos that entered the stomach has now been transformed into a semifluid paste called chyme. Peristaltic waves push the chyme out of the stomach through the pyloric sphincter into the duodenum of the small intestine. Now in the duodenum, accessory organs add their secretions to the chyme. First is the pancreas. It adds

The Journey of Food Through the Body

728 words - 3 pages food. The stomach uses hydrochloric acid (HCL) and enzymes to break up the food into a consistency of a paste. The paste is called chyme, a substance where your body starts to extract the nutrients it needs. From there the chyme goes into the small intestine. Step 4: The Small Intestine The small intestine is a long tube coiled in the abdomen, approximately 20 feet long spread out. The small intestine continues to break down the food by enzymes

digestion of a sandwich

721 words - 3 pages stomach are contracting. This causes the food to be turned and moved all throughout the stomach. This process turns the food into chyme, which is just a liquefied version of the food that was first taken in by the mouth. This process that the stomach does can take anywhere from twenty minutes to an hour to completely liquefy the food into the chime substance. The next place for the sandwich bite to go is the small intestine. The small intestine

Digestion: Describe the digestion of a burger

406 words - 2 pages pepsin. This pepsin starts out as the inactive pepsinogen, and is activated by hydrochloric acid in the epithelium. After this, the burger is churned in the stomach and becomes chyme, or vomit.From the stomach, the burger goes through the pyloric sphincter and into the small intestine. In the first 25 cm of the small intestine, the food goes through the duodenum, a place where pancreatic enzymes and bile from the live are stored. Bile, along with

Science Digestive

741 words - 3 pages , esophagus, stomach, small intestine, large intestine, the rectum, and the anus.!! The Oral Cavity & Salivary Glands! is the beginning of the digestive process and is where the teeth break food into smaller particles during mastication. This is a form of mechanical digestion, which is when food is digested by movement rather than reaction with chemicals. In this video, biting is indicated by cutting the food with a knife. Salivary glands located

Food Travels Through the Body

1925 words - 8 pages . Furthermore, muscle contractions in the stomach’s wall help mix food. Partially-digested food turns into a thick liquid that is called “chyme.” A muscular ring, which is called the “pyloric sphincter,” guards the stomach’s exit and relaxes to release chyme into the small intestine. After the stomach is emptied, the contraction of muscles and secretion slows down. The stomach contents are now ready to travel to their next destination—the small

Similar Essays

Tissue Engineered Small Intestine Essay

1131 words - 5 pages Stem cells have played a pivotal role in tissue engineering of the small intestine. Unlike the MSCs and HSCs, intestinal stem cells almost guarantee the regeneration of all types of intestinal cells (absorptive-columnar, goblet, Paneth, and auto endocrine cells), including muscle cells. Although HSCs from the peripheral blood had been shown to engraft in the gut lining when leukemia patients received transplantation of hematopoietic stem cells

The Effects Of Glp 2 On The Small Intestine Are Igf 1 And Igf 1 R Dependent

2335 words - 10 pages epithelial insulin-like growth factor-1 (IGF-1) has been demonstrated to be a significant intermediary pathway for the actions of GLP-2 on the small intestine (1). Intestinal sub-epithelial myofibroblasts (iSEMFs) have been identified to release IGF-1 which binds to its receptor in the epithelium to facilitate growth and function of GLP-2 (2). To provide further evidence that GLP-2 is involved in cell proliferation, GLP-2 was administered to measure if it

Action Of Amylase In The Small Intestine Experiment Lab Report

530 words - 2 pages Testing the action of amylaseAim: To see if the starch solution is broken down in the visking tube by the amylase and then passed through it into the beaker where we can test it for glucose.Hypothesis: I think that Glucose shall be present in the solution outside the Visking tube after 15 minutes has passed.Apparatus:BeakerLab coatsGogglesHeat plateTongsSyringeStarch SolutionBenedict SolutionWaterTest tubesStringVisking tubeThermometerStop

Digestive System My Directions Were To Start With The Stomach And Describe What Happens To The Food As It Goes Through The Digestive System

520 words - 3 pages The food in the stomach gets physically ground up and chemically worked on by the gastric juices. At the end of this process, this mixture of partially digested food and gastric juices is given the name chyme...From the stomach, the chyme travels through the pyloric sphincter valve (which opens when the stomach is full, it allows only small amounts into the small intestine at a time) and into the duodenum, the first part of the small intestine