Biology 206 - Biology 206: Lecture Notes Anatomy and...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology 206: Lecture Notes Anatomy and Physiology Lectures Spring Term 2008 Hypothalamic control of endocrine functions Carried by hypophyseal portal vein that passes through infundibulum HIF's and HRF's influence the secretion of hormones by the anterior pituitary Hypothalamus produces the hormones of the posterior pituitary Neurohormones are transported via axons that pass through the infundibulum Pituitary merely stores and releases these hormones into the capillary system Portal Circulation Normal blood flow Heart - Arteries - Capillaries - Veins - Heart Portal blood flow Heart - Arteries - Capillaries - Vein - Capillaries - Vein - Heart (organ 1) (portal) (organ 2) Portal blood flow allows blood to flow from one organ directly to another organ without first returning to the heart -- the hypothalamus can secrete HRF's and HIF's into the blood and these chemicals will be delivered directly to the pituitary Endocrine Hormones and Action Gland Hormone Action Ant. Pituitary Growth Hormone (GH) growth of body cells/protein anabolism/fat catabolism Thyroid Stim. Hormone controls secretion of thyroid (TSH) Adrenocorticotropin control secretion of adrenal cortex (ACTH) Follicle Stim. Hormone egg development/estrogen (FSH) secretion/sperm production Leuteinizing Hormone ovulation/progesterone secretion (LH) preps mammary gland and stimulates testosterone production
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Prolactin initiates and maintains milk (PRL) secretion Post. Pituitary Oxytocin labor contractions and milk (OT) let-down reflex Antidiuretic Hormone decreases urine volume/ (ADH) increases blood pressure by constricting arterioles Thyroid gland Thyroxine regulates metabolism/growth/ (T 3 and T 4 ) development/nervous system activity Calcitonin (CT) lowers blood calcium levels by stimulating the action of osteoblast cells that lay down bone matrix Parathyroid gland Parathyroid Hormone increases blood calcium levels by (PTH) increasing calcium absorption in the gut and by increasing the activity of osteoclasts Adrenal Cortex Mineralocorticoids increases blood sodium levels and (aldosterone) secondarily blood volume (water) Glucocorticoids stimulates metabolism/increases (Cortisol) resistance to stress/act as anti-inflammatory agents/over long periods of time they reduce
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/25/2009 for the course BIOSC 205 taught by Professor Boreckey during the Fall '07 term at Carlow University.

Page1 / 55

Biology 206 - Biology 206: Lecture Notes Anatomy and...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online