HUBS1406 Lecture Notes - Lecture 5: Tachycardia, Peripheral Nervous System, Gallbladder

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Central nervous system (cns): brain, spinal cord. Peripheral nervous system (pns): nerve fibres either coming out of or into the spinal cord (spinal nerves) or brain (cranial nerves). Myelin sheath- not all neurons have it, the ones that signal the fastest have it. Synapse- the foot of the axon coming up to another cell to connect chemically. Controlled by the somatic division of the nervous system. Controlled by the autonomic division of the nervous system. Subdivided into two divisions: (sends nerves to the same set of organs and structures, activated via different conditions) Sympathetic: fight or flight response, activated by threat or danger. Fast heart rate + increased strength of beating. Smooth muscle shuts off to prevent gut contents moving around the length of the gut. Dilate to shift more air in and out more quickly. Decreased heart rate + decreased strength of beating.

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