BIO 203 Lecture Notes - Lecture 1: Circulatory System, Comparative Physiology, Anaerobic Respiration

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A physiologist is interested in how things work . Formal de(cid:128)nition : the biological study of the functions of living organisms and their parts. Operational de(cid:128)nition : the study of how cells interact with their environment to obtain the things required for life ( vital substances) Any system that allows for the exchange of materials ( vital substances ) from: Respiratory (o 2 , co 2 ), digestive (nutrients, h 2 o), urinary (excretion/h 2 o) Tissue level (groups of cells with common structure and function) Organ level (organization of di(cid:130)ferent tissues to perform speci(cid:128)c functions) System level (several organs organized carry out major body functions) Frame the way we think about questions. Is constrained by laws of physics and chemistry. Can tolerate only a limited range of conditions. Body (cid:131)luids of all animals have the same general composition. H 2 o and salts (very much like sea water) Water is the major component and is (in humans) .

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