In the lungs gas exchange occurs to re-oxidize the blood. Air travels through the respiratory tract to reach the lungs and back up to be exhaled into the environment. At the termination point of the respiratory tract lays the alveoli. The alveoli have a sac-like structure. In biological systems, the structure and functions of components are related. The alveoli have a structure specialized for efficient gaseous exchange. In the structure of the alveoli (alveolus), it looks as if it has the form of a hollow cavity that is paired with elastic fibers...
... middle of paper ...
...sorption. The microvilli contain various protein channels and plasma membranes that contain pumps that use ATP. They allow the effective movement of nutrient subunits through diffusion and active transport. These subunits include monosaccharides, nucleic acids, glycerol, amino acids and fatty acids. For them to reach the circulatory system, the nutrient subunits pass through the wall of the small intestine to enter a dense network of capillaries that are found within the villi. The capillary will allow the transportation of the nutrient subunits to reach the tissues of the body; this movement of nutrients into the blood is known as absorption. The villi increase the surface area of the small intestine over which food may be absorbed. The waste products of this process, such as fiber, are then pushed into the colon, where they wait to be expelled by a bowel movement.
Need Writing Help?
Get feedback on grammar, clarity, concision and logic instantly.Check your paper »
- ... Then after the horror of being mechanically digested by the teeth. By squirting through the salivary glands saliva drowns Banana with enzymes such as ptyalin breaking down his nutrients into easier absorbable nutrients by chemical digestion for the child. Next in the line of torture it has moved past the inclosed windpipe by the epiglottis to the esophagus a long tube of darkness lined with slippery mucus. The esophagus has been using the motion of peristalsis a wave of muscle contractions that are so strong it can be done in any position to transfer food to the sphincter that leads into the stomach.The Pancreas disperses these enzymes such as amylase.... [tags: banana, died, mouth, system]
846 words (2.4 pages)
- Once again we have been miniaturized in the submarine to continue the fantastic voyage of the digestive system. We will be touring a 55-year-old male. The host will be having a hamburger, French fries, and a root beer. We will be tracing lunch through the digestion process. Digestion is the process of turning the food that is ate into energy needed to survive and involves creating waste to be eliminated. (Mohan, 2010). The digestive tract is a long twisting tube that starts at the mouth and ends at the anus, called the alimentary canal.... [tags: Anatomy]
1868 words (5.3 pages)
- The digestive system is a very important system in the human body. It is a group of organs that work together to turn food into energy and nutrients in the entire body. The food that was chewed in a humans’ mouth now passes through a long tube that is inside of the body that is known as the alimentary canal. The alimentary canal is made of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. Those few things are not the only important accessories of the digestive system there is also the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.... [tags: turning food to energy]
1624 words (4.6 pages)
- The human digestive system is a bodily process made up of many systems, organs and substances that break down food both physically and chemically for use by the body. But what exactly is human digestion and what happens to food as it moves through the digestive system. “…[digestion] is a group of organs working together to convert food into energy and basic nutrients to feed the entire body” (Tim Taylor). There are three major bodily mechanisms that contribute to the process of digestion. The first mechanism is the breakdown of food, the second mechanism is the process of extracting nutrients from food, and the third mechanism is excretion, or the body’s natural waste system.... [tags: body, enzymes, organs]
1538 words (4.4 pages)
- ... The Process of the Digestive System This complicated process begins in the mouth as soon as you put the food in your mouth. Salivary amylase, which is found in saliva, starts the chemical digestion of starch by converting it from a polysaccharide to the disaccharide maltose. It functions best with a pH 6 or 7 which is slightly acidic. It then enters the pharynx and travels down the esophagus and into the stomach. The stomach is lined with strong muscular walls that contain millions of gastric glands.... [tags: foods, nutrients, waste]
1401 words (4 pages)
- The ideal purpose of the gastrointestinal or digestive system is to take the immense bolus’ of food made of lipids, carbohydrates, and protein and dissect them into particles tiny enough so that they can be consumed into the cardiovascular system of the body where the body can deploy on the the substances necessary for health and progression in the body. The way these bolus’ of food are dissected is by a process called mastication and the chemical changes of the gastrointestinal system and it’s enzymes.... [tags: pancreas, protein, acid]
525 words (1.5 pages)
- The Digestive System The digestive system is a group of organs that perform the process by which food, containing nutrients, is eaten and broken down into different components. This breakdown makes it possible for the digested material to pass through the intestinal wall into the blood stream. The digestive process contains many different steps that take place in many different organs.The first step of digestion begins at the mouth, where the food enters the mouth. Saliva is secreted from the salivary glands.... [tags: Anatomy Processes Eating Digestion Essays]
1263 words (3.6 pages)
- The Digestive System What are the main functions in digestion of the a) mouth b) stomach c) small intestine The mouth takes in the food and uses the teeth and the salivary glands do break down the food so it could move onto the next phase. The teeth chew food while the salivary glands, liver, bile duct and pancreas produce digestive juices to break down food. The stomach is a L shaped, organ situated on the left side of the abdominal cavity beneath the diaphragm. At either end of this organ is a sphincter muscle which contracts and relaxes to control the movement of food in and out of he stomach.... [tags: Papers]
696 words (2 pages)
- The Structure and Function Of Arteries, Veins and Capillaries In its route from the heart to the tissues, the blood passes through channels of six foremost types: elastic arteries, muscular arteries, arterioles, capillaries, venules and veins. I intend to explore the structure and function of arteries, veins and capillaries. When an artery branches into smaller and smaller vessels, eventually the blood vessel is too small to see with the naked eye. At that point, it is called an arteriole.... [tags: Papers]
839 words (2.4 pages)
- Purpose The digestive system prepares food for use by hundreds of millions of body cells. Food when eaten cannot reach cells (because it cannot pass through the intestinal walls to the bloodstream and, if it could would not be in a useful chemical state. The gut modifies food physically and chemically and disposes of unusable waste. Physical and chemical modification (digestion) depends on exocrine and endocrine secretions and controlled movement of food through the digestive tract. Mouth Mouth Food enters the digestive system via the mouth or oral cavity, mucous membrane lined.... [tags: essays research papers]
1034 words (3 pages)