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Good Links. http:// health.howstuffworks.com/human-body/systems/endocrine/adam-200091.htm http:// www.youtube.com/watch?v=8fh2HmdxQjQ http://www.youtube.com/watch?v=1IQQPtyE7Lc&feature=related. Just the Facts.
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Good Links • http://health.howstuffworks.com/human-body/systems/endocrine/adam-200091.htm • http://www.youtube.com/watch?v=8fh2HmdxQjQ • http://www.youtube.com/watch?v=1IQQPtyE7Lc&feature=related
Just the Facts • The endocrine and nervous system act individually and together in regulating an animal’s physiology • Endocrine system- all the hormone secreting cells and tissues. • Ductless • Hormones – chemical signals that cause a response in a target cell • Controlled by positive and negative feedback • Exocrine glands – ducted glands • Sweat • Oil
Hormones bind to: • Cell-surface receptors and a signal transduction pathway is triggered. • Intracellular receptors- lipid soluble, steroid hormones use this method – bind to a receptor that acts as a transcription factor and causes a gene to be expressed
Hypothalamus and pituitary integrate many functions of the vertebrate endocrine system. • Posterior pituitary • Oxytocin • ADH • Anterior Pituitary • FSH • LH • GH • Prolactin • TSH • ACTH
Thyroid Gland • Triiodithyronine • Thyroxine • Calcitonin
Parathyroid • Parathyroid Hormone
Pancreas • Insulin- Beta Cells of the Islets of Langerhan • Glucagon – Alpha Cells of the Islets of Langerhan
Adrenal Gland • Adrenal Medulla – secretes epinephrine and norepinephrine • Adrenal Cortex – secretes glucocorticoids • mineralocoroticoids
Gonads • Testes – Androgens – Testosterone • Ovaries – Estrogens, and Progesterone
Pineal • Melatonin – regulates body rhythms – light /dark cycles
Abnormal HormonesToo much or Too little GH Giantism Dwarfism
Thyroid gland Hyperthyroidism Hypothroidism
Adrenal gland Addison’s Disease Hypoadrenalism Cushing’s Hyperadrenalism