Skeletal Muscle 1 Flashcards
How is skeletal muscle classified?
Usually attached to skeleton
Used for locomotion, posture, respiratory
How is Visceral Muscle classified?
Lines the walls of internal organs and blood vessels
What are histological classifications of muscle tissue?
Striated
Smooth
What nerves control skeletal muscle
Somatic Motor
What controls cardiac muscle
Endocrine and Autonomic Nervous System
What are muscle cells called?
Fibers
What is the endomysium?
CT surrounding individual fibers
What is the perimysium?
CT surrounding Bundles of fibers (fasciculi)
What is the Epimysium?
CT surrounding the entire muscle
What is the most basic unit of muscle contraction?
Sarcomere
What is inside muscle fibers?
Myofibrils
What is each myofibril composed of?
Repeating sarcomeres
What two lines make up the boundary between adjacent sarcomeres?
Z Lines
What are the thin filaments made of?
Actin
Tropomyosin
Troponin
What are the Thick filaments made from?
Myosin
What is the sarcolemma made of?
Plasma membrane and a basement membrane
What are the T Tubules an extension of?
Sarcolemma
What is the main function of the sarcoplasmic reticulum?
Uptake
Storage
Release of Calcium ions
Which network runs parallel to the myofilaments, t-tubes or SR?
SR
What is Excitation-Contraction Coupling?
Its the term for the depolarization and subsequent release of calcium that allows for contraction
How does the AP penetrate deep into the muscle tissue?
By using the t-tubules
Where is the junction that communicates the AP with the release of Ca?
Where the T-Tubule meets the SR Terminal Cisternae
What do the Ca ions bind with when released from the SR?
Troponin C
What is the major difference between skeletal and cardiac muscle in terms of AP production?
Cardiac muscle creates its own APs, its signal does not come from the nervous system
