HHP 3500 Study Guide - Midterm Guide: Facilitated Diffusion, Body Water, Osmosis

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Health and human physiology exam 1 study guide. Homeostasis: process by which physiological variables are kept relatively stable despite challenges (ex. Negative feedback-a change in variable away from set point intiates a responses, bringing it back towards set point (ex. Positive feedback-change away from set point causes events that further stimulate that changes (ex. Contractions during labor, immune system) feed forward-body adjusts variable prior to any actual change, in anticipation for future needs (ex. Salivation when you smell food: type of balancing: Dynamic constancy: types of homeostasis regulation and their associated pathways. Occurs in a local area, therefore does not travel in efferent/afferent pathways. Hyperemia-increased blood flood to specific area that needs more blood from increased metabolism. Unlearned control systems linking a stimuli with responses by reflex arc. Chemical composition: 4 types of messengers to communicate in the body: Hormone-released by endocrine glands into blood where it travels to a target celltravels through blood stream further distances.

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