Please enable JavaScript.

Coggle requires JavaScript to display documents.

Nervous System Intro (Neural Tissue Activities (action potential (voltage…

- - - - unmyelinated axons
      - 1 segment of axon @ a time
    - - myelinated axons
      - faster, less energy
      - current jumps node to node
      - depolarization @ nodes
  - - - chemical gradients
      - electrical gradients
    - - sodium-potassium ATPase
        
        3 Na+ out
        
        2 K+ in
        
        maintains resting -70mV potential
    - - Passive/leak
        
        always open
        
        permeability changes w/ conditions
      - Active/gated
        
        open/close to stimuli
        
        at rest, most closed
        
        Chemically gated
        
        chemical opens channel, chemical gone -> closes
        
        GRADED POTENTIAL
        
        voltage gated
        
        activation and inactivation gates
        
        ACTION POTENTIAL
        
        mechanically gated
        
        pressure opens channel
- - - - perikaryon/soma
        
        synthesizes proteins, membranes, chemicals
        
        rough ER
        
        CNS- nuclei
        
        PNS- ganglia
      - processes
        
        dendrites
        
        receptive input region
        
        axons
        
        axon hillock
        
        long= nerve fiber/tract
        
        occasional branches= collaterals
        
        distal ends= axon terminals
        
        secretes neurotransmitters
        
        Type A
        
        Type B
        
        Type C
  - - - ependymal cells
      - microglia
      - astrocytes
      - oligodendrocytes
    - - satellite cells
      - schwann cells
  - - - chemical synapse
      - electrical synapse
- - - - connexons
      - direct physical contact btwn cells
    - - signals across gap by neurotransmitters
  - - - depolarization of postsynaptic membranes
      - promote action potentials
    - - cause hyper-polarization of postsynaptic membranes
      - suppress action potentials
  - - - direct & simple
      - Na, K, Ca
    - - indirect & complex
      - secondary messengers
        
        cyclic AMP
        
        diacylglycerol
        
        calcium
- - - - interprets sensory info
      - dictates motor output
  - - - communicate between CNS & body
    - - somatic nervous system
        
        voluntary
        
        CNS -> skeletal muscles
      - autonomic nervous system
        
        parasympathetic division
        
        rest & digest
        
        sympathetic division
        
        fight or flight
        
        visceral/involuntary
        
        CNS -> cardiac, smooth muscle, and glands
    - - receptors -> CNS