pre Class 11 - intro to muscle structure and function
skeletal muscle functions
-Produces major body movements -Stabilizes body positions -generates heat
troponin
3 subunit complex on the thin filament
electrical excitability
A property of both neurons and muscle cells
thin filament (actin)
What B?
Thick filament (myosin)
What is C?
titin filament
What is the spring like connector of the thick filaments to the Z disc?
sarcomere contraction
What is this stage of myofilament overlap?
sarcomere relaxation
What is this stage of myofilament overlap?
sarcoplasmic reticulum
What's this? -intracellular storehouse of calcium ions
Tropomyosin
blocks myosin binding sites on the thin filament during relaxation
muscle fascicles
bundles of muscle fibers
cardiac muscle function
contractions of the heart create pressure to propel blood through the circulatory system of the boy
Alpha actinin
primary structural protein of the Z-disc
myomesin
primary structural proteins of the M-line
three types of muscle
skeletal, cardiac, smooth
smooth muscle function
storage is accomplished by sustained contractions of ring-like bands of smooth muscle called sphincters
sarcomere
what is A? -contracting subunits making up each myofibril
myofibrils
what is C? -contractile assembly of proteins in a muscle cell
muscle fiber
what is D? -muscle cell
transverse tubules
what's this? -extension of the plasma membrane
Elasticity
Ability of a muscle to return to its original shape after a contraction or extension
Contractability
Ability of muscle to contract forcefully when adequately stimulated
Extensibility
Ability of muscle to stretch without being damaged
