The digestive system is essentially a long, twisting tube that runs from the mouth to the anus, plus a few other organs (like the liver and pancreas) that produce or store digestive chemicals. What Is the Function of the Digestive System? The primary function of the digestive system is to break down the food we eat into smaller parts so the body can use them to build and nourish cells and provide energy. Structure of Human Digestive System * Mouth The mouth is the beginning of the digestive tract; and, in fact, digestion starts here when taking the first bite of food. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.
Identify factors that affect the amount of time it takes for food to travel through the digestive tract - Explain how digestion occurs in mouth, stomach, small intestine, large intestine – The body starts the digestion process before food even enters the mouth. As soon as something that smells good hits the nose, the body starts to salivate and produce stomach acids. Once it enters the mouth, the body gets to work. All three salivary glands (the parotid, sublingual and submandibular) produce saliva which begins to chemically break down the food. The tongue and teeth move the food around, mixing it with the saliva, with all 32 teeth tearing and crushing it to break it down further into a softer composition called a bolus.
Liver – Major role in dealing with the nutrient products of food digestion. Detoxifies harmful substances in the intestines. Involved in recycling red blood cells by breaking them down. By product is bile, which is important in the breakdown of fats. Produces essential proteins and clotting factors for the blood and regulates metabolism and cholesterol.
Supplying enough energy to support the many functions of the body at work and play is one of the chief functions of food. This energy comes from the fats, carbohydrates, and proteins in the food you eat. Without energy stored in our bodies- our bodies would not function. It is required for the molecules to move in and out of the cells, for breaking down large molecules and also foe building new ones. The role of energy in our body consists of the breakdown of large, complex molecules to the simplest form to release energy, this is called catabolism.
Diffusion helps to remove dissolved carbon dioxide from the blood and into the expelled air from lungs. Diffusion is the molecules (gas or liquid) moving from high concentration to low concentration. M1: Discuss the role of energy in the body. Our bodies need energy to work properly. The energy we need and use comes from the type of foods we eat.
CU2653 Prepare For and Carry Out Extended Feeding Techniques 1.1Anatomy and physiology of the gastro-intestinal tract: Digestion of food begins in the mouth. When you swallow, food is pushed down into the oesophagus, a muscular tube that carries food to the stomach where it is digested. From the stomach, food travels to the small intestines, where digestion continues and nutrients are absorbed into the bloodstream. 1.2 The importance of fluid and nutritional balance: Eating food provides you with nutrients that are necessary for your body to function, grow, and repair its self. We need to consume six types of nutrients to sustain life: carbohydrates, protein and fat, which all provide energy, but in different forms, vitamins and minerals,
SCI/241 THE SCIENCE OF NUTRITION January13,2012 Human Digestion How the does the digestive system works to absorbs nutrients? Digestion starts with the smell of food, it activates the salivary glands. The gland secret saliva that moistens food, it also contains a digestive enzyme called amylase that breaks down some carbohydrates before it leaves the mouth. Then the food is swallowed and goes into the lumen through the esophagus. The esophagus muscles contractions called peristalsis forces the food through the sphincter valve and into the stomach.
Support the absorption of carbohydrates and proteins B. accept chyme from the stomach and complete digestion C. Absorbs B12,bile salts, fluids and electrolytes and secretes enzyemes that further break down carbohydrates and proteins 14. Slow the passage of food along the intestines and increase surface for absorption 15. A. Absorbs B12,bile salts, fluids and electrolytes and secretes enzyemes that further break down carbohydrates and proteins B. Creates a space for liquids to empty into C. Move waste up and out of the body D. Absorbs water from stool E. Absorbs water from stool and stores food that will be emptied into the rectumlts F. Moves stool into rectum 16. Secretes pancreatic juice, insulin, glucagon, duodenum, and somatostatin into the bloodstream.
The energy helps us to move our muscles, walk and talk; without the energy in our body we would not be able to do basic things. “It cannot be created or destroyed but can only be changed from one type to another.” [2] Metabolism Metabolism is a collection of chemical reactions that take place in the cells of a human body. They help to sustain life. It converts the carbohydrates, fats and proteins into energy that our body absorbs. Metabolic rate is how fast or slow a person burns off the energy that they get from food whilst at rest, this can determined whether the person puts on weight or loses weight.
Those hormones are called ghrelin and leptin. Ghrelin is produced by the stomach and the hypothalamus. It increases before meals and decreases after. The hypothalamus has receptors for ghrelin and this hormone is what tells us when we are hungry. Leptin, on the other hand, does the exact opposite.