BSC 215 Study Guide - Quiz Guide: Vasodilation, Paracrine Signalling, Positive Feedback

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Metabolism- break down compounds from environment to get energy; maintain homeostasis; viruses are not alive. Growth- cells can divide and make new cells; population growth. Adaptation- genes change through mutation; mutation can be bad. Reproduction- related to growth but passes genes to next generation. 1st level- chemical level- lipid group is not charged; phosphate group is charged; 3rd level- tissue; extracellular matrix; 4 different tissues (connective, epithelial, muscle and nervous) Homeostasis- the creation and maintenance of a relatively stable internal environment to facilitate the numerous physiological processes that cells undergo. Stimulus regulated variables receptors (measuring the variable) control. Center (interprets and acts on signal from receptor; makes the decision) effector. Stimulus (core body temperature decreases) receptor (certain brain cells detect temperature change) control center (brain interprets and acts on body temperature signals) effector. Explain how negative and positive feedback loops maintain homeostasis. Change in regulated variable results in effects that feedback to the same variable.

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