BIO 203 Study Guide - Midterm Guide: Epithelium, Integumentary System, Organism

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Physiology: the biological study of the functions of living organisms and their parts. How cells interact with their environment to obtain the things required for life. External: organism interacts, exchanges substances with the external environment. Cells: cells exchange with their external environment which is the internal environment. Exchange systems: any system that allows for exchange of vital substances from external to internal or internal to cell. Examples: skin (integumentary): absorbs and interacts with external environment, respiratory system (o2/co2, digestive system (nutrients/h2o, urinary system (excretion/h2o, circulatory system (distribution): links exchange systems so that the substances can travel wherever in the organism that needs a substance. Aquatic: we have evolved from organisms that first lived in marine environments. Body fluids of all animals have same general composition: h2o and salts=seawater. 75% of body weight in humans, 99% of all molecules in humans made of water. Salts: . 75% of molecules are salts (na, k, cl, ca, mg, zn, po4)

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