PSL201Y1 Chapter Notes -Collagen, Portal Vein, Catecholamine
Document Summary
Secondary endocrine organs: secretion of hormones is secondary to some other function. Primary endocrine organs are located outside the nervous system (thyroid gland, parathyroid gland, thymus, adrenal glands, pancreas, gonads). Secondary endocrine glands include organs (heart, liver, stomach, small intestine, kidney, skin). They function together to regulate every body system. Hypothalamus is a primary endocrine gland because it secretes several hormones, which affects the pituitary gland (connected to the hypothalamus by thin stalk of tissue infundibulum). The pituitary gland is divided into the anterior lobe and posterior lobe. Released by exocytosis when signaled by neurons (neurohormones): adh regulates water reabsorption by the kidneys. Oxytocin stimulates uterine contractions and milk letdown in the breasts. Blood connection between hypothalamus and anterior pituitary: the anterior lobe and the cells of the hypothalamus that control it, secrete tropic hormones, It affects the release of a 3rd hormone from another endocrine gland, which effects target cells.
