Lab Quiz 4 Flashcards
(27 cards)
Sarcolemma
Cell membrane of muscle fibers.
Sarcoplasmic reticulum (SR)
Surrounds myofibrils. Smooth ER. Have terminal cisternae.
Terminal Cisternae
Wider area on either side of the transverse tubule.
Triad
T tubule, SR, terminal cisternae
Transverse Tubules
Bands around myofibrils running perpendicular to the length of the myofibrils.
Terminal Cisternae
Wider area of the SR on either side of the transverse tubules.
Myofilaments
The small threadlike structures that make up myofibrils
Myofibrils
The contractile structures of a muscle fiber. Contractile proteins are located within.
Actin
Thin filaments.
Myosin
Thick filaments.
Titin
Protein that anchors the filaments.
Sarcomeres
The contractile units of muscle.
Z disc
Ends of the sarcomere
M line
Center of the sarcomere
A band
Entire length of the thick filaments in a sarcomere.
I band
Area with only thin filaments in a sarcomere.
H zone
Area with only thick filaments in a sarcomere.
Muscle fiber
A muscle cell.
Endomysium
Connective tissue surrounding each individual muscle cell.
Fascicle
Perimysium wraps a group of muscle fibers into a fascicle.
Perimysium
Connective tissue wrapped around a group of muscle fibers. Makes a fascicle.
Epimysium
Connective tissue surrounding multiple fascicles, which creates a muscle.
Deep fascia
Groups muscles of similar functions
Tendons
Extension of connective tissue that attaches to the bone. All connective tissues extend past the muscle fibers, which creates a tendon that is attached to the bone.
