BIOL 2160 Study Guide - Midterm Guide: Cytosol, Dehydration Reaction, Thymine

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Physiology: the study of how the body functions. Levels of physiological organization: molecules (atp, water, neurotransmitter receptors, cells (neurons, epithelial cells, tissue (nervous tissue, muscle tissue, organs (heart, liver, organ systems (cardiovascular, gastrointestinal) Secretes molecules into a body cavity, or to the exterior of the body: connective tissue, characterized by very few cells and lots of extracellular materials, mostly water or protein. Homeostasis: the ability to maintain a relatively stable internal environment despite fluctuations in the external environment, wells, stable internal state while external environment changes, accomplished through negative feedback. Negative feedback: return internal conditions to a set point . Involves 3 things: sensors: detect change and send information to the integrating center. Integrating center: assesses change around a set point. Positive feedback: moves conditions further away from a set point, ex. Labor: contractions of the uterus are caused by oxytocin which is released from the brain to. Input and output are the same contract the uterus.

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