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Hormone Regulation (Hormone receptors (Down regulation (Decrease receptor…
Hormone Regulation
Hormone receptors
Affinity changes
Down regulation
Decrease receptor synthesis
Degrade existing receptors
Inactivate
Reduce sensitivity
Up regulation
Increase receptor synthesis
Activate
Increase sensitivity
Make new receptors
External environment
Circadian light cycles
Feeding
Stress
Hypothalamus
Mostly release stimulating hormones to pituitary
Monitors feedback
Pituitary
Posterior
Nerves
Anterior
Storage
Secretion
Rates
Delivery
Production
Degradation
Elimination
Feedback mechanisms
Autocrine
Can be inhibitory too
IGF-1
Acts on production cell
Paracrine
Somatostatin from pancreatic islet cells
Local action
Positive
LH surge
Childbirth
1 - cervical dilation stimulates posterior pituitary
2 - posterior pituitary releases oxytocin
3 - oxytocin stimulates more uterine contractions
Negative
Glucose regulation
Thyroid function
Neural
Preganglionic sympathetic nerves synapsing on adrenal medulla