Pituitary Gland Flashcards
Tropic hormone
Target endocrine cells
Non-tropic hormone
Target tissues and organs
Functions
- Adrenal
- Thyroid
- Gonadal
- Lactation
- Parturition
- Growth
- Water balance
- Metabolism
Anterior pituitary gland
Endocrine tissue
Posterior pituitary gland
Neural tissue.
Direct continuation of hypothalamus.
AP stimulating hormones
- TRH
- CRH
- GHRH
- GRH
- PRH
- GHIH
- PIH
AP endocrine hormones
- TSH
- ACTH
- FSH
- LH
- GH
- Prolactin
PP neurohormones
- Vasopressin (ADH)
- Oxytocin
Prolonged exposure to low plasma [hormone]
Up-regulation of receptor number
Prolonged exposure to high plasma [hormone]
Down-regulaton of receptor number
Permissive effect
Presence of one hormone enhances the effect of another.
- TH is permissive to epinephrine
Antagonistic effect
Presence of one hormone reduces effect of another
- GH decreases insulin effectiveness
Neurohormone secretion from posterior pituitary
Activation of oxytocin/vasopressin-specific magnocellular neurons in hypothalamus
