Muscular Structure Flashcards
What makes up a Triad in a muscle cell
2 terminal cisternae + 1 Transverse tubule
Sarcolemma
Membrane of a single muscle cell/fiber
Transverse Tubules (T-tubule)
maintain property of muscle fiber membrane
Carry signals from nerves deep into muscle fiber through its lumen
Terminal Cisternae
Store + release calcium
Sarcoplasmic Reticulum
Store + release calcium
What is a Muscle Fiber made of?
Made of myofibrils
Very long → thus called “Fibers” and not cells
What is a Fascicle?
Bundle of muscle fibers
What is Endomysium?
Layer of deep fascia
Surrounds an individual muscle fiber
What is Epimysium?
Layer of deep fascia that Surrounds whole muscle
What is Fasia?
Dense irregular connective tissue deep to the skin.
What are the two kinds of Fasia
→ Superficial Fasia: thin spider-weby dense connective tissue beneath skin
→ Deep(Muscular) Fasia: epimysium, perimysium, endomysium
What is the Perimysium
Part of deep muscular fasia
Forms fesicle
Surrounds bunches of muscle fibers
What is a myofibril?
Contractile proteins grouped within muscle cell
Example: The myofibrils in muscle cells are responsible for muscle contraction.
What is a sarcomere
Structural, functional contractile unit of a muscle cell
Space from one Z-disc to another Z-disc
M line
Midsection of A band
A Band (Dark Band)
Made of thick filaments
Sarcomere
Structural, functional contractile unit of a muscle cell
I Band (Light Band)
Thin filaments + Z disc
H Zone
Space where contraction occurs, disappears during contraction
