Test Chapter 9 Flashcards
Three types of muscles
Skeletal, smooth, cardiac
Structural differences between cardiac and skeletal muscles
Cardiac has circulated discs and one nucleus, skeletal has no circulated discs and multiple nucleus
Muscle prefixes
Myo, Mys, sarco
What are the two myofilaments
Actin and myosin
What’s the thin filament
Actin
What’s the thick myofiliments
Myosin
What does it mean when a muscle becomes repolarized
Restoration of resting conditions (relaxing)
What molecule blocks the active site on actin when a muscle relaxed
Tropomyosin
Explain why energy is needed to repolarize a muscle
Getting calcium pumped back into the SR for us to relax
What’s ATP
directed mechanical energy, usable energy
All muscles share what 4 characteristics
Excitability, contractility, elasticity, extensibility
What’s insertion
What’s moving
What’s origin
What’s moving it
Sheaths from big to small
Epimysium, perimysium, endomysium
What’s endomysium
Fine areolar connective tissue surrounding each muscle fiber
What’s the A band
Dark regions (contains the H-zone)