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Nerve, Muscle, and Heart - Coggle Diagram

- - - - Macroglia
        
        Astrocytes
        
        most common
        
        small round
        cell body
        
        Send projections to other cells
        
        Perivascular feet sit on stuff
        
        Probably metabolic transport
        
        Oligodendrocytes
        
        Myelin sheath
        
        many processes
      - Microglia
        Macrophage
        immune protectors
    - - Schwann cells
        
        send out processes
        
        myelin sheath
        
        macrophages
        
        Bulging nucleus
  - - - Dendrites
        
        single or multiple
        
        same cyto as body
        but no Golgi
      - Axon,
        Myelin sheath
        
        Arises from hillock
        
        Microtubules, neurofilaments
        and mitochondria, no Golgi
      - Cell body
        
        Nucleus, prominent
        nucleolus
        
        mito, lyso, Golgi
      - Terminal branches
      - Nissl Substance
        free ribosome and rER
        through cell, not in axon
      - Nodes of Ranvier
    - - multipolar
      - bipolar
      - pseudounipolar
        SENSO
      - unipolar
        SENSO
    - - motor (efferent)
      - somatic (voluntary)
      - sensory (afferent)
      - autonomic (involuntary)
- - - - don't confuse with ranvier
      - anchoring point
      - rapid spread of stimulus
- - - - A band thick myosin filaments
      - H zone center of A band (no actin)
      - I band thin filament only
      - M line center of H zone
      - Z disc attachment of actin
        middle of I band
        
        delineates sarcomere
    - - A band unchanged
      - I band shortens
      - H band narrows
      - Z lines brought closer
      - ADP + Pi --> Pi released
        
        head pivots --> pulls actin filament
        and releases ADP
        
        Binds ATP --> releases actin
        
        ATP hydrolysis, head energized and attaches
      - Troponin attaches to tropomyosin
        block actin in resting muscle
      - Sarcoplasmic Reticulum
        surrounds myofibrils, has Ca pumps
      - T tubules tubular inholdings of cell
        membrane penetrate SR and encircle fibril
        --> Ca release simultaneously
        --> uniform contraction
      - ACh release provokes it