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The Endocrine System

The Endocrine System. 6-3. f rom “I Run With the Bulls” by Mike Silva, 1995.

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The Endocrine System

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  1. The Endocrine System 6-3

  2. from “I Run With the Bulls” by Mike Silva, 1995 And then the gun goes off. I run up the cobblestone street. People are jogging at a moderate pace. There’s no tremendous push for speed….The second gun goes off – now people pick up the pace: the bulls have been released….There’s a sudden burst of speed, energy, panic, of bodies, and the bulls are in the ring. I high tail it to the perimeter, having heard too many tales of bulls going mad in the ring….I caught up with Von and Don. I was just about the ask Don a question when I saw a bull charging Von. He stood frozen for a second, and at the last second jumped sideways in a crescent shape, as the bull missed him and tried to put his shoulder into Von. We ran up to him and he was five shades of white….

  3. Brain Communication Systems • Nervous system • Endocrine system

  4. The Endocrine System • Sends chemical messages (hormones) through the body • Hormones – made in the endocrine glands, travel in the blood and other body fluids • Ductless glands – go straight into the bloodstream

  5. Hormones • Have various effects: • Body growth • Metabolic process • Get the body ready for action • Influence moods

  6. Pituitary Gland • Controls growth and water and salt metabolism • Master gland • Controls the output of hormones by other glands • Hypothalamus monitors hormones in the blood & sends messages to correct inbalances

  7. Thyroid Gland • Produces the hormone thyroxine • Stimulates certain chemical reactions important for all tissues of the body • Not enough thyroxine – feel lazy (hypothyroidism) • Too much thyroxine – lose weight, be over active (hyperthyroidism)

  8. Adrenal Glands • Work when you are frightened or angry • Release epinephrine (adrenaline) and norepinephrine (noradrenaline) • Cause the heartbeat and breathing to increase • Heighten emotions • Give extra energy to handle tough situations • Release cortical steroids – help muscles develop & make the liver release stored sugar

  9. Sex Glands • Types: • Ovaries – females • Produce eggs & hormone estrogen & progesterone • Testes – males • Produce sperm & sex hormone testosterone

  10. Hormones vs. Neurotransmitters • Both affect the nervous system • Neurotransmitters – released next to the cell it is to excite or inhibit, travel quickly • Hormones – go into the bloodstream, travel more slowly

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