1. INTRODUCTION The digestion in humans involves the chemical and mechanical breakdown of food and it’s absorption from the gut. Stimuli around the body start the different stages of digestion. These stimuli occur in the head, stomach and small intestine. There are three phases to digestion and each stage has different nerve reflexes.
CheckPoint: Human Digestion I am describing, the path food follows through the digestive system and how digestion occurs in each of the following parts of the digestive system. I am including in the description of other organs or components of the digestive system, including: * Large intestine * Mouth * Small intestine * Stomach After the food enters the mouth and after being moistens and chewed by the teeth, the food then converts into a Bolus. Bolus as mentioned refers to the softened mass of munched on food that passes through the digestive system. The bolus then exits the mouth and progresses into the pharynx. The bolus then moves down into the esophagus, which follows to the stomach.
Peristalsis also is at work in this organ, moving food through and mixing it with digestive secretions from the pancreas and liver. The duodenum is largely responsible for the continuous breaking-down process, with the jejunum and ileum mainly responsible for absorption of nutrients into the bloodstream. Pancreas-The pancreas secretes digestive enzymes into the duodenum, the first segment of the small intestine. These enzymes break down protein, fats, and carbohydrates. The pancreas also makes insulin, secreting it directly into the bloodstream.
Angela Ross Checkpoint: Human Digestion Describe in 200 to 300 words, the path food follows through the digestive system and how digestion occurs in each of the following parts of the digestive system. Be sure to include descriptions of other organs or components of the digestive system, including: * Large intestine * Mouth * Small intestine * Stomach The digestion process starts with the ingestion of food through the mouth. Within minutes after food is placed in the mouth the teeth chew the food into smaller pieces and the saliva mixes with the food transforming it into a bolus. The bolus mixture goes through the pharynx and travels down the esophagus into the stomach. Once the bolus reaches the stomach which has an acidic environment converts the bolus into a semi-liquid mass called chyme.
Then the esophagus pushes the food to the stomach, and that’s when things really start to happen! The pancreas which are the two organs in the digestive system, make digestive juices and the juices help digest food breaking –down protein, carbohydrates ,and fat. Every 24 hours, the pancreas sends 1 to 2 pints of digestive enzymes through the pancreatic duct into the duodenum. After the pancreas, comes the liver which is used to dissolve fat and break down even more. From the stomach the food travels through the small intestine, which transfers water and nutrients into the blood and then other parts of the body.
The hydrolyzed chylomicrons become chylomicron remnants. These remnants continue to circulate until they interact through apolipoprotein E together with the chylomicron remnants receptors, originated mainly in the liver. This contact normally causes the endocytosis of these chylomicron remnants, which hydrolyze within the lissome. The lysosomal hydrolysis leads to the release of fatty
Once inside the small intestine, enzymes are released that allow the usable parts of the food to be absorbed into the body for energy. The first section of the small intestine where this begins is called the duodenum and the end of the small intestinal tract is known as the ileum. The ileum is where the last useable amounts of nutrients are absorbed from food. The next step in the digestive process is the large intestine. Once inside the large intestine, the process slows to allow the absorption of final nutrients and also allows bacteria to grow.
Digestion of carbohydrates begins in the mouth as mentioned earlier with the enzyme amylase which is present in the saliva. This breaks the carbohydrates into their simpler subunits (saccharide forms). In the stomach, the carbohydrates are converted into chyme with the peristaltic action of the stomach. Next, the chyme will pass into the duodenum. At the introduction to the duodenum, alpha amylase is secreted by the pancreas and further breaks down the carbohydrates into primary simple sugars.
Stomach Cells Kashena Walton SC: 235 General Biology 1: Human Perspectives Instructor: Jeffery Parker Kaplan University I will be discussing the stomach and describing the cells and how they function. According to (Ireland, 2012) the human body has four major tissue types: muscular, nervous, epithelial, and connective. Tissues working together form organs, such as kidney, stomach, liver and heart. The stomach is a muscular internal organ that lies between the esophagus and the small intestine in the upper abdomen. The stomach is not only our digestive system it absorbs food but, rather is a part of the digestive system and important for churning food into a consistency that is easier to digest for the rest of our intestines( Stomach and role in digestion).
When the nose smells a type of food, it triggers the production of saliva in the mouth, so it is technically the beginning of the digestive process. Each organ or body part after that depends on the one that comes before it to be able to do its job correctly. In order for one to clearly understand the process of digestion, it must be divided into three stages. Without question, the first stage of digestion is divided into two parts, the mouth and the esophagus. Digestion first begins in the mouth.