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Endocrine System, Nervous System and Homeostatic Control

Endocrine System, Nervous System and Homeostatic Control . Review for Unit Test #1. Endocrine system. Information signaling system Glands produce hormones Circulate through blood vessels Regulate: mood , growth and development , tissue function , and metabolism. Hypothalamus.

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Endocrine System, Nervous System and Homeostatic Control

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  1. Endocrine System, Nervous System and Homeostatic Control Review for Unit Test #1

  2. Endocrine system • Information signaling system • Glands produce hormones • Circulate through blood vessels • Regulate: • mood, growth and development, tissue function, and metabolism

  3. Hypothalamus • The hypothalamus controls body temperature, hunger, thirst, fatigue, anger, and circadian cycles. • Secretes hormones that tell other glands to create their hormones • GHRH

  4. Pineal Body • Secretes Melatonin • Melatonin may help regulate sleep patterns

  5. Pituitary Gland • Growth • Blood Pressure • Sex Organ Functions • Conversion of food into energy • Water regulation

  6. Thyroid • Controls how quickly the body burns energy, makes proteins, and how sensitive the body should be to other hormones.

  7. Parathyroid • The sole function of the parathyroid glands is to maintain the body's calcium level within a very narrow range.

  8. Pancreas • Regulates blood sugar by producing Insulin

  9. Adrenal gland • Produces Adrenaline • Fight or Flight Response • Dilate pupils • Increase heart rate • Suppress non emergency process • Boost oxygen and glucose supply

  10. Testes and Ovaries • Both produce hormones to support body function • Testes • Testosterone • Ovaries • Progesterone • Estrogens

  11. Nervous system • Made up of two major parts • Central Nervous System (CNS) • Peripheral Nervous System (PNS)

  12. Neurons

  13. Central Nervous System • Brain and Spinal Cord • Nerves • Ganglion

  14. Brain • Consists of lobes, Each lobe having different functions.

  15. Function • Process information • Dictate reactions and behaviors

  16. Peripheral Nervous system • Nerves from spinal cord to rest of body • Create locomotion • Etc…

  17. Feedback Loops • Your nervous system is involved in almost all homeostatic control loops. • Reflex arc • Sensory Vs Motor • Affector Vs Effector

  18. Neuron Function • Dendrites • Myelin • Schwann Cells • Axon • Node of Ranvier

  19. Threshold • Before a neuron can send out a signal the stimuli has to pass the threshold

  20. Action Potential • An action potential is a nerve impulse • An electrical shock sent down the axon

  21. Action Potential

  22. Synapse • A synapse occurs where ever the action potential meets the end of the axon • It needs to propagate across that gap • It does this through chemical messengers

  23. Neurotransmitter= Acetylcholine Enzyme that destroys it = Acetylcholinesterase

  24. Synapse • When Acetylcholine jumps across the gap, it tells the next neuron to fire it’s action potential and the process continues

  25. Homeostasis Summary • Homeostasis is the maintenance of a stable internal state within an organism. • Organisms must respond and maintain homeostasis in relation to many factors. • Organisms detect changes in their environment and respond to these changes in a variety of ways.    • These changes may occur at the cellular or organism level.

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