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Endocrine System

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Karina Alvarado

on 23 April 2013

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Transcript of Endocrine System

Endocrine Glands secrete hormones into the bloodstream Endocrine System functions in metabolism, fluid balance, growth and reproduction
slow, long-lasting response Maintaining Homeostasis By Karina Alvarado Endocrine System Hypothalamus
receives information from internal (monitors water concentration, blood temperature and hormone concentration) or external (sound, taste, smell) environment
when it detects a change in the body, it releases (starts a process) or inhibits (stops a process that already occurring) hormones that are located in the pituitary gland
Pituitary Gland
stores and secretes 2 hormones: oxytocin and antidiuretic hormone (ADH) chemical messengers that are carried in the blood and cause a response Glands Pineal Gland Thyroid Pancreas Adrenal Medulla cont. Hormone: Melatonin
Function: circadian rhythm Hormone
lowers blood calcium level Parathyroid Hormone: PTH
Function: raises blood calcium level Hormone
lowers blood sugar
raises blood sugar Adrenal Cortex Hormone: Epinephrine
Function: fight or flight Hormone: Glucocorticoids
Function: raise blood glucose level Ovaries Hormone: Estrogen
Function: female sex characteristics Testes Hormone: Testosterone
Function: male sex characteristics Protein Hormones
can NOT diffuse across cell membrane
binds to receptor proteins on plasma membrane, activating a "second messenger"
ex. polypeptides, glycoproteins and amines Lipid Hormones
diffuses across cell membrane
binds to receptor protein in cytoplasm and nucleus, activates/inhibits genes
ex. steroids keeps the body condition at equilibrium When an abnormal change happens within the body, it triggers negative feedback mechanisms Pancreas release insulin Normal Blood Glucose Level Type of Hormones Liver takes up glucose and stores as glycogen body cells take up more glucose blood glucose level rises after eating Pancreas release glucagon Liver breaks down glycogen into glucose blood glucose level drops below normal Testes this stops a process that's already occurring and changes it in the opposite direction
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