The human gastrointestinal system
By: Tarek Musslimani
The gastrointestinal system or the digestive system as it is sometimes referred to consists of the mouth, the esophagus, the stomach and the small and large intestine. The food is digested partially in the mouth by chewing and by the action of the enzyme amylase...
Liver disease: Structural changes in the liver
By: Dr Pandula Siribaddana
Liver is a delicately structured organ which will perform several vital tasks in order to keep the person healthy. Among its tasks, metabolism of harmful elements, detoxification, storage of excess nutrients, producing protein elements to perform certain functions, conversion of nutrient elements in to active...
Structure and function of the skin
By: Tarek Musslimani
The skin is the covering layer of the body. It has a protection function as is seen from the type of epithelium that its epidermis layer has. It has a stratified sqaumous keratinized epithelium, which is composed of several layers of cells. The skin of...
Explanation of the mechanism of breathing
By: Alicia M Prater PhD
Breathing is a necessary mechanism in the human body. A breath occurs in two parts, inhalation (or inspiration) and exhalation (or expiration). The breathing cycle is controlled by the nervous system, particularly the respiratory center of the brain, and respiratory muscles. Inhalation requires contraction of...
The chemoreceptors of the tongue
By: Alicia M Prater PhD
Each human tongue contains an average of roughly 10,000 chemoreceptors. These microscopic hair-like nerve endings, called microvilli, are encapsulated in a protective envelope on a short stalk, called papillae. These buds sense chemicals in food, giving them their flavor. These "taste buds" are also...
The sense of taste: Different tastes picked up by the human tongue
By: Alicia M Prater PhD
Taste is the sensing of flavor in food and other material that is ingested. Taste is possible because chemicals stimulate receptors on the tongue, the taste buds. How something tastes can tell an individual whether that something is food or inedible, like cardboard, and toxic...
By: Dr Pandula Siribaddana
Swallowing is the process in which the food taken via mouth is mechanically broken down, made into a bolus, passed on to the pharynx and send down the esophagus into the stomach. All these actions are taken by sealing off the nasal passages as well...
By: Dr Pandula Siribaddana
Introduction: Saliva is a secretion made from the salivary glands located around the oral cavity. There are three types of such glands and Submandibular glands contribute to at least 70% of the total salivary secretions whereas the Parotids only contribute to about 25%. Even though...
What are sinuses?
By: Eric Lannak
The sinuses are usually written off as “four pairs of air-filled chambers in the facial bones that connect to the nose”, but for the 35 million who suffer from chronic sinus problems in the U.S. alone, or the 500,000 who will have...
The differences between veins and arteries
By: Erich Rosenberger M.D.
The circulatory system is an amazing series of vessels which are responsible for moving blood to every cell in the body. Blood, in turn, carries vital oxygen and other elements to the cells, and transports waste products to the liver and kidneys for removal. Think...

 

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