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Amylase
The enzyme that digests starch into disaccharides
Anemia
The lack of blood; caused when the number of red blood cells is reduced than the normal
Appendix
Anon-functional finger-like process attached at the blind end of caecum
Assimilation
The incorporation of the products of digestion into the body, where they are used to provide energy or for the growth and repair of tissues
Balanced diet
A diet which contains all the essential nutrients like carbohydrates, fats, proteins, minerals, and vitamins in the correct proportion for the normal growth and development of the body
Bolus
The small, slippery, spherical mass of food formed in the oral cavity during the processes of mastication, lubrication, and semi-digestion
Cardiac sphincter
The opening between the esophagus and the cardiac portion of the stomach (sphincter means an opening which is guarded by muscles)
Chyme
The soup-like mixture formed after the action of the stomach on food
Constipation
The condition where a person experiences hard feces that are difficult to eliminate
Diarrhea
The disease when required water is not absorbed in blood from the colon and watery stools result
Dietary fiber
The part of human food from plant material that remains indigestible
Digestion
The process in which the large and non-diffusible food molecules are broken down into smaller and diffusible molecules (that can cross the membranes)
Duodenum
The first 10 inches (25 cm) of the small intestine
Emulsification
The process by which bile salts keep lipid droplets separate from one another
Epiglottis
The flap of cartilage on the glottis (opening of the trachea in the pharynx)
Famine
The lack of enough food to feed all the people living in an area
Fertilizer
The material which is added to the soil for desirable characteristics
Gastric juice
The secretion of the gastric glands of the stomach; composed of water, mucous, hydrochloric acid, and pepsinogen
Gastrin
The hormone secreted by special cells in stomach walls by the stimulation of peptides present in food: gastrin stimulates the cells of gastric glands to secrete more gastric juice
Goiter
The condition in which the thyroid gland becomes enlarged due to an insufficient amount of iodine in the diet
Ileum
The last 3.5 meters long part of the small intestine; is concerned with the absorption of digested food
Intestinal juice
The secretion from the intestine walls contains many enzymes for the complete digestion of all kinds of food
Jejunum
The 2.4 meters long part of the small intestine present after the duodenum
Kwashiorkor
Disease due to protein deficiency: the patient may grow to normal height but are abnormally thin
Lacteal
A vessel of the lymphatic system present in the villus
Laxatives
The medicines are given to relieve constipation
Lipase
The enzyme that digests the lipids into glycerol and fatty acids
Liver
The largest gland of the body: secretes bile into the duodenum and performs many other important functions
Malnutrition
Problems related to nutrition are grouped as malnutrition
Marasmus
Disease due to protein deficiency, the patient loses all their muscle strength and acquires a skeletal appearance
Mineral deficiency diseases
Diseases resulting from the deficiency of a mineral e.g.
- Goiter
- Anemia
Nutrition
The process in which food is obtained or prepared, absorbed and converted into body substances for growth and energy
Esophagus
The long tube (25 cm in an adult humans) connects the pharynx with the stomach
Oral cavity
The first part of the alimentary canal; the space behind the mouth
Over intake of nutrients
Over-intake of nutrients (OIN) is a form of malnutrition in which more nutrients are taken than the amounts required for growth, development, and metabolism.
Pancreas
The gland that secretes pancreatic juice in the duodenum also produces the insulin hormone
Pancreatic juice
The secretion of the pancreas that contains enzymes trypsin, pancreatic amylase, and lipase
Pepsin
The active form of enzyme pepsinogen that partially digests the proteins into shorter peptide chains
Pepsinogen
The inactive enzyme present in gastric juice; activated into pepsin by HCI
Peristalsis
The rhythmic sequence of waves of contraction in the smooth muscles of the walls of the alimentary canal, thus squeezing the food down along the alimentary canal
Pharynx
The section of the alimentary canal after the oral cavity and before the oesophagus
Protein-energy malnutrition
Protein-energy malnutrition refers to inadequate availability or absorption of energy and proteins in the body. It may lead to diseases such as:
- Kwashiorkor
- Marasmus
Pyloric sphincter
The opening between the pyloric portion and small intestine
Rectum
The last part of the large intestine: opens out through anus
Saliva
The secretion from the salivary glands: contains, water, mucous, and amylase enzyme
Starvation
Starvation is a severe reduction in nutrient and energy intake and is the most horrible effect of malnutrition.
Stomach
The dilated part of the alimentary canal, on the left of the abdomen, beneath the diaphragm
Swallowing
During swallowing the bolus is pushed to the back of the mouth by the tongue.
Trace minerals
The mineral in human food that is required in amounts less than 100 mg per day
Trypsin
The enzyme present in pancreatic juice, for the digestion of proteins
Ulcer
Peptic ulcer: A sore in the gut lining caused by a gradual breakdown of the tissue by the acidic gastric juice
Villus
The finger-like projection present on the inner walls of the ileum
Vitamins
The chemicals that are required in low amounts but are essential for normal growth and metabolism
Water-soluble vitamins
Water-soluble vitamins are absorbed directly in the blood, and travel freely: excess is excreted in the urine and is needed infrequent doses (1-3 days) e.g. B-complex and Vitamin C.
Glottis
The opening of the trachea in the pharynx
Macronutrients
The elements required by plants in larger quantities
Micronutrients
The elements which are required in lower quantities
Nutrients
The elements and compounds that an organism obtains as energy sources or as components for the synthesis of new materials
Obesity
Becoming over-weight: one reason is the intake of food that contains energy more than their requirement and does very little physical work