PSL201Y1 Chapter : PSL201 – Feb 14 – Endocrine 2 Hypothalamus and Pituitary Gland.docx
Document Summary
The endocrine system: endocrine glands and hormone actions two types of endocrine glands: primary endocrine organs: secrete hormones, secondary endocrine organs: secretion of hormone is secondary to some other function. Hypothalamus and pituitary gland: regulate virtually every body system. Hypothalamus: secretes hormones which affect the pituitary gland. Pituitary gland: connected to hypothalamus, two parts; posterior lobe and anterior lobe. Adh: synthesized in the paraventicular nucleus and lesser in the supraoptic nucleus. Oxytocin: synthesized in supraoptic nucleus and lesser in paraventicular nucleus. After synthesis they are packed into vesicles and transported to axon terminals in the post. Released into blood by exocytosis when signal is received. Anterior lobe secretes trophic hormones: hormones that regulate secretion of other hormones: can be a stimulating hormone or a inhibiting hormone. Hypothalamic-pituitary portal system: connects anterior lobe and hypothalamus, arrangement of blood vessels, when the hypothalamus secretes hormones they travel down to the anterior lobe. Trophic hormones of the hypothalamus and anterior pituitary:
