Digestive System II: The Lower Gastrointestinal Tract

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Digestive System I: The Upper Gastrointestinal Tract
Identify what happens when supply exceeds demand. To prepare for careers in agriculture, food, and natural resources, students must acquire technical knowledge in the discipline as well as apply academic skills in mathematics. Protein Digestion and Absorption Process. By creating an account, you agree to Study. They will identify the differences between parallel and series circuits. Meanwhile, digestive enzymes are secreted from the liver and pancreas as zymogens , which, you may remember, are inactive precursors of enzymes that require a change to be activated.

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Chewing begins the physical process of breaking large chunks of food into smaller pieces. The food is swallowed and directed by the epiglottis down the esophagus the tube that serves as a passage for food from the pharynx to the stomach. The epithelial cells of the stomach secrete three major products: Pepsinogen is a zymogen , which is an inactive precursor of an enzyme that requires a change to be activated. HCl converts it to the active enzyme pepsin , which is a digestive enzyme that breaks proteins down into smaller peptides.

Together, pepsin and hydrochloric acid are the major components of gastric juice, which essentially liquefies food and continues to break it down into smaller components. However, when a person sees, smells, or otherwise anticipates eating food, the brain sends a signal to the stomach to start preparing for a meal. As a result of this signal, the epithelial cells secrete a small amount of hydrochloric acid into the stomach.

Smooth muscle is also activated and starts churning the stomach at a low rate. When food actually enters the stomach, the epithelial cells secrete lots of gastric juice and the smooth muscle of the stomach thoroughly mixes the food and gastric juice until it is liquefied. The stomach empties, and powers-down until it receives the next signal to prepare for a meal. To unlock this lesson you must be a Study. Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities.

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By creating an account, you agree to Study. Explore over 4, video courses. Find a degree that fits your goals. The Upper Gastrointestinal Tract Did you know that there are digestive enzymes in your saliva?

As soon as you put a piece of food in your mouth, the digestive process begins. Join us with this first of two lessons about the human digestive system, where we'll follow food through the upper gastrointestinal tract from the mouth through the stomach.

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Want to watch this again later? Anatomy and Physiology of the Mouth. Functions of the Lymphatic System. Gross Anatomy of the Urinary System. The Human Vascular System. Anatomy and Physiology of the Large Intestine. Physiology of the Stomach and Gastric Juices.

Blood Coagulation and Wound Healing. What is the Small Intestine? Causes, Symptoms, and Treatment. Heartbeat and Heart Contraction Coordination. Anatomy of the Heart: Blood Flow and Parts. Gas Exchange in the Human Respiratory System. Life, Physical and Chemical. Practice and Study Guide. Did you know that there are digestive enzymes in your saliva? Upper Gastrointestinal Tract All is calm in the rainforest.

The Mouth The digestive process begins when amylase in saliva starts to break down food As Timmy chewed the butterfly and physically broke it down into smaller pieces, his salivary glands went to work, releasing saliva containing amylase - a digestive enzyme that breaks large polysaccharides into smaller ones. The Throat The tongue then forms the chewed-up and saliva-soaked food into a ball and directs it to the back of the mouth.

The Stomach The stomach is a fairly large organ with an elastic wall. Epithelial cells lining the stomach wall secrete gastric juice One major component of gastric juice is hydrochloric acid , which you may remember is a very strong acid.

Pepsin Speaking of digestive enzymes, another major component of gastric juice is pepsin. Try it risk-free No obligation, cancel anytime. Want to learn more? Select a subject to preview related courses: When food is seen or smelled, the brain sends a signal to the stomach When food enters the stomach, it activates the full response. Lesson Summary So, let's review. JumpStart Academy Learn how school2home ecosystem can help your learner.

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Add to Add to Add to. Want to watch this again later? The Upper Gastrointestinal Tract. Anatomy and Physiology of the Large Intestine. What is the Small Intestine? Anatomy of the Heart: Blood Flow and Parts. Movement Through the Small Intestine: Physiology of the Stomach and Gastric Juices. Nutrient Absorption and Role In Digestion. Lipids Digestion and Absorption. What Is the Pancreas?

Carbohydrate Digestion and Absorption: Regulation of Blood Pressure: Protein Digestion and Absorption Process. Passive Transport in Cells: Muscle Origin and Insertion: Life, Physical and Chemical. Practice and Study Guide. The lower gastrointestinal tract is the part of the digestive system that is responsible for the last part of food digestion and the expulsion of waste from the body. The Lower Gastrointestinal Tract When we last left Timmy, he was playing in his backyard pretending to be his favorite animal, a chameleon.

Digestion in the Duodenum We know that liquefied food and gastric juice is released by the pyloric sphincter a little at a time from the stomach into the duodenum , which is the first section of small intestine where digesting food enters from the stomach.

Lipids repel water and clump together, which makes them insoluble Lipid Digestion However, fats are a little more complicated. Absorption in the Small Intestine The small intestine can be broken down into three parts.

Try it risk-free No obligation, cancel anytime. Want to learn more? Select a subject to preview related courses: After the duodenum are the jejunum and ileum The Large Intestine and Rectum The large intestine , or colon, functions mainly to reabsorb most of the water that wasn't reabsorbed by the small intestine.

Lesson Summary So, let's review. Unlock Your Education See for yourself why 30 million people use Study. Become a Member Already a member? Earning College Credit Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities.

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