endocrine system Flashcards
A chemical substance, usually secreted by an endocrine gland ( also herons & fat cells) that influence
growth, metabolism, reproduction
Stimulation
from neural response, other hormones, or hum oral factors
Reduction
decrease in neural activity humoral stimuli (negative FB), metabolized in liver/kidneys or excreted in urine or bile
GH
mobilization fo fatty acids and reduces glycogen use, greater not faster ATP use
Thyroxin
increased HR and contractility, metabolic rate
Cortisol
increases gluconeogenesis, suppresses various immune cells
Epinephrine
increase glycogen breakdown, increased HR and contractility
Insulin
increase glucose and amino acid uptake, synthesis of fat
Glucagon
increase release from liver, breakdown of fat
Anabolic
testosterone, Growth hormone
Catabolism
Cortisol and a lesser extent glucagon
General Hormone Mechanism
induce secretory activity
Eg: TSH factor produced by hypothalamus that acts on the anterior pituitary to produce thyrotropin which stimulates the secretion of thyroxin from thyroid
Alter enzyme activity
Modify cell membrane transport
Influence gene expression & synthesis of intracellular proteins
