Table of Contents
Definition
Anemia
The lack of blood; caused when the number of red blood cells is reduced than the normal
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Definition
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
Definition
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
Definition
Bolus
The small, slippery, spherical mass of food formed in the oral cavity during the processes of mastication, lubrication, and semi-digestion
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Definition
Cardiac sphincter
The opening between the esophagus and the cardiac portion of the stomach (sphincter means an opening which is guarded by muscles)
Definition
Constipation
The condition where a person experiences hard feces that are difficult to eliminate
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Definition
Diarrhea
The disease when required water is not absorbed in blood from the colon and watery stools result
Definition
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)
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Definition
Emulsification
The process by which bile salts keep lipid droplets separate from one another
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Definition
Gastric juice
The secretion of the gastric glands of the stomach; composed of water, mucous, hydrochloric acid, and pepsinogen
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Definition
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
Definition
Goiter
The condition in which the thyroid gland becomes enlarged due to an insufficient amount of iodine in the diet
Definition
Ileum
The last 3.5 meters long part of the small intestine; is concerned with the absorption of digested food
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Definition
Intestinal juice
The secretion from the intestine walls contains many enzymes for the complete digestion of all kinds of food
Definition
Kwashiorkor
Disease due to protein deficiency: the patient may grow to normal height but are abnormally thin
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Definition
Liver
The largest gland of the body: secretes bile into the duodenum and performs many other important functions
Definition
Marasmus
Disease due to protein deficiency, the patient loses all their muscle strength and acquires a skeletal appearance
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Definition
Mineral deficiency diseases
Diseases resulting from the deficiency of a mineral e.g.
- Goiter
- Anemia
Definition
Nutrition
The process in which food is obtained or prepared, absorbed and converted into body substances for growth and energy
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Definition
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.
Definition
Pancreas
The gland that secretes pancreatic juice in the duodenum also produces the insulin hormone
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Definition
Pancreatic juice
The secretion of the pancreas that contains enzymes trypsin, pancreatic amylase, and lipase
Definition
Pepsin
The active form of enzyme pepsinogen that partially digests the proteins into shorter peptide chains
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Definition
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
Definition
Pharynx
The section of the alimentary canal after the oral cavity and before the oesophagus
Definition
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
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Definition
Starvation
Starvation is a severe reduction in nutrient and energy intake and is the most horrible effect of malnutrition.
Definition
Stomach
The dilated part of the alimentary canal, on the left of the abdomen, beneath the diaphragm
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Definition
Trace minerals
The mineral in human food that is required in amounts less than 100 mg per day
Definition
Ulcer
Peptic ulcer: A sore in the gut lining caused by a gradual breakdown of the tissue by the acidic gastric juice
Definition
Vitamins
The chemicals that are required in low amounts but are essential for normal growth and metabolism
Definition
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.
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Definition
Nutrients
The elements and compounds that an organism obtains as energy sources or as components for the synthesis of new materials
Definition
Obesity
Becoming over-weight: one reason is the intake of food that contains energy more than their requirement and does very little physical work
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