BIOL-1110 Chapter Notes - Chapter p.1044-65: Endocrine Gland, Extracellular Fluid, Sweat Gland

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An endocrine system allows slow, diffusion and communication. Hormones maintain homeostasis by a negative feedback loop. The pituitary allows the brain to continue most of the endocrine system. Hormone: chemical that is secreted into body fluid. Has effect on tissues distant from point of secretion. Like a messenger carrying information to cells telling them to do/change certain things. Exocrine gland: secrete into a duct rather than the bloodstream. The endocrine system and nervous system interact to regulate the body. Endocrine system: slow responding but long lasting. Neurohormones: chemicals released by neuron into blood. Body wide effect but usually influence close tissue. Pheromones: chemicals secreted into the air or water surrounding organism. Local regulator: signal molecule that acts on nearby cells. Autocrine regulator: chemical that controls the tissue that secretes it. Paracrine regulator: chemical that is released from a cell, diffuses through interstitial fluid and has an effect only on neighboring cells. 49. 3 mechanisms of hormone action injury or infection.

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