1 / 36

The Nervous System

The Nervous System. 2 N.S. structures (p.156) : Peripheral Nervous System – Nerve endings branched out among the extremities Central Nervous System – brain and spinal cord. The Nervous System. 2 Major parts of peripheral (158): Somatic - Voluntary actions

lyris
Download Presentation

The Nervous System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. The Nervous System 2 N.S. structures (p.156) : Peripheral Nervous System – Nerve endings branched out among the extremities Central Nervous System – brain and spinal cord

  2. The Nervous System 2 Major parts of peripheral (158): Somatic - Voluntary actions Autonomic - involuntary (heartbeat, stomach, etc.) What about breathing & blinking?

  3. The Nervous System Autonomic parts A. Sympathetic - prepares for emergencies: blood pressure , digestion stops, etc.

  4. The Nervous System Autonomic parts B) Parasympathetic - conserve energy & recover (drop in b.p., etc.)

  5. The Nervous System 2 important parts of the Central: A. Spinal Cord (neurons) B. Brain

  6. The Nervous System: Micro From BODY to BRAIN…and back- (crosses at a synapse) Neurons: long, thin cells that transmit data within the body Neuron message transmission is a combination of - electrical and chemical

  7. The Nervous System: Micro Neuron parts include (label): *Dendrites *Axons (myelin) *cell body *nucleus *synapses *Axon terminals

  8. Dendrites *bring info. TO the cell body *many dendrites / cell *branch NEAR the cell body

  9. Axons *take info. AWAY FROM the cell body *usually few (or one) axon / cell *branch further from cell body *release neurotransmitters

  10. How the Nervous System Works Nerve impulses -electrical within (the neuron) -chemical across (the synapse)

  11. Endocrine System • Sends messages to the body using Hormones Through the Bloodstream

  12. Endocrine System Pituitary Gland -Under the direction of the Hypothalamus -”master gland” that regulates other endocrine glands -regulates growth and metabolism

  13. Endocrine System Thyroid • produces thyroxine • too little = lazy and lethargic (hypothyroidism) - too much = overactive: loss of weight & sleep (hyperthyroidism)

  14. Endocrine System Adrenal Glands - active when angry or frightened - release epinephrine (adrenaline) & norepinephrine (noradrenaline) • can influence emotions (fear & anxiety) • Steroid release helps w/ energy when needed

  15. Endocrine System Sex Glands • testes: sperm & testosterone • ovaries: eggs, estrogen & progesterone • Affect physical & sexual development

  16. Hormones vs Neurotransmitters slow, widespread messages between cells bloodstream rapid, specific messages

  17. The Nervous System 2 N.S. structures (p.156) : Peripheral Nervous System – Central Nervous System –

  18. The Nervous System 2 Major parts of peripheral (158): Somatic - Autonomic -

  19. The Nervous System Autonomic parts A. Sympathetic -

  20. The Nervous System Autonomic parts B) Parasympathetic -

  21. The Nervous System 2 important parts of the Central: A. Spinal Cord (neurons) B. Brain

  22. The Nervous System: Micro From BODY to BRAIN…and back- Neurons: Neuron message transmission is a combination of -

  23. The Nervous System: Micro Neuron parts include (label):

  24. Dendrites * * *

  25. Axons * * * *

  26. How the Nervous System Works Nerve impulses within (the neuron) across (the synapse)

  27. Endocrine System • Sends messages to the body using Through

  28. Endocrine System Pituitary Gland - - -

  29. Endocrine System Thyroid -

  30. Endocrine System Adrenal Glands - - -

  31. Endocrine System Sex Glands

  32. Hormones vs Neurotransmitters * * * *

More Related