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Endocrine Overview

Stack #33214

QuestionAnswer
hormones chemical messengers released into the blood to be transported throughout the body
What classes are hormones divided into? amino acid based, steroids
hormonal stimulus typically produces one or more of the following changes alters PM, stimulates synthesis of proteins or or activates enzymes in the cell, induces secretory activity, stimulates mitosis
Name the two second messenger systems used by amino acids cyclic AMP, PIP Calcium Signal
Steroid Hormones use this action mechanism direct gene activation
The concentration of a circulating hormone in the blood at any time reflects: its rate of release, the speed at which it is activated and removed from the blood
Permissiveness the situation when one hormone cannot exert its full effects without another being present
Example of Permisiveness reproductive hormones and thyroid hormone
Synergism more than one hormone produces the same effects at the target cell and their combined effects are amplified
Example of Synergism glucagon, and epinephrine
Antagonism when one hormone opposes the action of another
Example of Antagonism insulin, glucagon
Humoral Stimuli hormones secreted in direct response to changing blood levels of certain ions and nutrients
Example of Humoral stimuli parathyroid cells releasing PTH in response to low blood calcium levels
Neural stimuli nerve fibers stimulate hormone release
example of neural stimuli sympathetic nervous system stimulation of the adrenal medulla to release catecholamines
hormonal stimuli endocrine glands release their hormones in response to hormone produced by other endocrine organs
example of hormonal stimuli release of most ant. pituitary hormones is regulated by releasing and inhibiting hormones produced by the hypothalamus
Created by: butterflee21
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