Digestive_System

Digestive_System - DIGESTIVE SYSTEM IMPORTANT CONCEPTS...

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DIGESTIVE SYSTEM
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IMPORTANT CONCEPTS Human beings are heterotrophic - unable to produce food from inorganic compounds An optimal diet contains all food groups in the proper proportions. Carbohydrates provide energy Fats - used for construction of membranes, provision of energy, insulation Proteins - for growth, repair, formation of substances such as enzymes & hormones
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Required in small quantities for good health Vitamins - organic & serve as cofactors Minerals - inorganic
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DIGESTION Conversion of complex food into a simple, soluble form Most foods need to be digested before they can be used by the body.
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DIGESTION Human beings digest food extracellularly , in the lumen of a highly specialized, muscular gastrointestinal tract that begins with the mouth and ends at the anus.
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DIGESTIVE SYSTEM FUNCTIONS Ingestion = intake of food Digestion = hydrolytic breakdown of macromolecules to release monomers Absorption = uptake of nutrients into blood/lymph Defecation = elimination of undigested material
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Oral Cavity(Mouth)
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ORAL CAVITY FUNCTIONS Cheeks and lips - keep food in the mouth Tongue - moves food - taste buds detect flavor of foods - lingual glands secrete saliva Hard & soft palate Teeth - chew food - decrease particle size & increase surface area
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Periodontal ligament is modified periosteum anchors into alveolus Cementum & dentin are living tissues Enamel is a protective non-cellular secretion Root canal leads into pulp cavity - has nerves Gingiva = gums Tooth Structure
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Digestive_System - DIGESTIVE SYSTEM IMPORTANT CONCEPTS...

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