Hormones: In circulation have receptors ? can cause change in metabolism, shape and motility and also gene expression. Thyroxine-comes from thyroid, regulates basal metabolism. Thyroxine will negatively feed back to hypothalamus so it does not signal interior pituitary to make thyroid stimulated hormones Steroid hormones (estrogen and testosterone) made form cholesterol Estrogen stimulates ovaries and brain has receptor that stimulates production of estrogen in ovaries. Estrogen maturation for oocyte and endometrial growth. LH stimulates ovulation Thyroid v Parathyroid, Thyroid: Thyroxin and calcitonin, keeps Ca levels low. Parathyroid hormone raises the Ca level back up Glucose levels: When glucose levels are low- Pancreas releases glucagon to break down glucose in the liver. When the sugar levels get too high, the pancreas releases insulin to the skeletal muscle and liver. Sodium and Water, regulated by the kidney. When you have not had any water recently, brain signals thirst, posterior pituitary ? ADH more H2O in the blood. Aldosterone from adrenal gland will tell nephrons to increase sodium intake. Moves the filtrate from the kidney back into the blood. (Cl, and H20 also).
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