Vocabulary: Muscle structure p'609610 30'730'8

1
Vocabulary Muscle structure- p.609-610- 30.7-30.8

• Tendon
• Skeletal muscle
• Myofibril
• Sarcomere
• Z lines
• Thin filament
• -actin
• Thick filament
• -myosin

2
Vocabulary Muscle structure

• Tendon- connective tissue that connects muscles
  to bone.
• Skeletal muscle- produces body movement, consists
  of a bunch of muscle fibers/cells.
• Myofibril- basic unit of muscle cells, causes the
  striations, consists of lots of sarcomeres.
• Sarcomere- the region between two dark lines (Z
  lines) in a myofibril, contractile part of
  myofibril.
• Z lines- consists of proteins that connect
  adjacent thin filaments.
• Thin filament- two strands of protein actin
  wrapped around regulatory protein.
• Thick filament- multiple strands of protein
  myosin.

3
(No Transcript)
4
Vocabulary Muscle structure

• 8. Fasicle- group of muscle fibers
• 9. Muscle fiber- muscle cell
• 10. Myofibril- long filamentous organelle in
  muscle cells, has a banded appearance
• Myofilaments- protein filaments- ex. Actin (thin
  filament) and myosin (thick filament)
• Sarcomere- segment of myofibril from one Z line
  to the next, contractile unit of muscle.
• 11. Sarcoplasm- cytoplasm

5
(No Transcript)
6
Connective tissue coverings membranous coverings

• Connective tissue coverings
• Fascia- surrounds muscle group (fibrous ct
  adipose)
• Epimysium- surrounds muscle under fascia
  (fibrous ct adipose)
• Perimysium- surrounds fasicle (fibrous ct)
• Endomysium- surrounds muscle cell/fiber (loose
  ct)
• membranous coverings
• Sarcolemma- cell membrane of muscle cell.
• Sarcoplasmic reticulum (ER)- network of
  membranous channels that surrounds myofibrils.
• Tranverse tubules (T tubules)- network of
  membranous channels lying between to sections of
  sarcoplasmic reticulum surrounding myofibrils.

7
(No Transcript)
8
(No Transcript)
9
Vocabulary review

• Connective tissue surrounding a fascicle.
• Connective tissue surrounding the entire muscle.
• Contractile unit of muscle.
• A muscle cell.
• Thin connective tissue surrounding each muscle
  cell.
• Plasma membrane of the muscle cell.
• A long, filamentous organelle found within muscle
  cells that has a banded appearance.
• Actin- or myosin- containing structure.
• Cordlike extension of connective tissue beyond
  the muscle, serving to attach it to the bone.
• A discrete bundle of muscle cells.

10
(No Transcript)