Chapter 7

• Muscle tissue


  excitable and contractile
• Muscle types

  1. skeletal (striated)
  2. cardiac (striated)
  3. visceral (smooth)
• Sarcolemma


  plasmalemma of skeletal muscle
• Motor end plate (MEP)


  area of neurotransmitter receptors
• Transverse tubules (TT)

  LOL idk tubes?
• Sarcoplasm


  cytoplasm of skeletal muscle
• Sarcoplasmic reticulum


  smooth endoplasmic reticulum

  repeating units
• Thin filaments: Z-lines
• Thick filaments: M-line
• Thin filament


  2 strands of actin woven together
• Thick filament


  bunch of myosin
• Sarcomere


  length: one z-line to the other
• Sliding filament theory of muscle contraction

  sarcomere length decreases but thin and thick filaments are still the same length

  this is due to the change in overlap of thick and thin filaments
• Endomysium


  CT layer around each cell

  type I and III collagen
• Perimysium


  around each fascicle (groups)

  type I collagen
• Epimysium


  top layer

  type I collagen
• Fascia


  loose CT layer that connects the epimysium to the next structure
• Aponeurons


  functions like a tendon but is a sheet
• Striations


  based on the difference in densities of the thin and thick filaments
• A-band


  length of the thick filaments
• I-band 


  area of only thin filaments

  end of A-band to Z-line
• H-band


  area of only thick filaments

  end of thin filament to thin filament