Flashcards in Chapter 10 (Part 1) Deck (44):
What are the functions of the muscle system?
Produce skeletal movement
Maintain posture/body position
Support soft tissue
Guards entrances and exits
made of groups of muscle fibers (muscle cells)
Covers whole muscle; separates muscle from surrounding tissues and organs
Around muscle fascicle, divides skeletal muscle into series of fascicles, contains blood vessels and nerves which will serve the muscle fibers located within
surrounds individual muscle fiber
Loosely interconnects adjacent muscle fibers
What does the endomysium contain?
capillary network, myosatellite, nerve fibers
Bundle of dense regular connective tissue attaching muscle to bone
Broad sheet of dense regular connective tissue providing a larger attachment which may include more than one bone
dense irregular connective tissue sheet external to the epimysium, separates muscle from each other
areolar and adipose connective tissue sheet; separates muscle from skin
cell membrane of a muscle fiber
cytoplasm of the muscle fiber
Narrow tubes continuous with the sarcolemma and extend into the sarcolemma
Tubular network surrounding each myofibril for storage of calcium ions
end of SR which has enlarged and fused with the t-tubule
T-tubule + Terminal Cisternae on each side
Actively move more calcium into the SR from sarcoplasm
Open in response to electrical stimulus allowing calcium out of the SR.
calcium gated ion channels
What does the membrane contain?
ion pumps, calcium gated ion channels,
bundles of myofilaments, protein filaments, surrounded by transverse tubules running the length of the muscle fiber
protein filaments necessary for muscle contraction
What are the 2 types of myofilament?
thick and thin
primary protein molecule of thick filament
long interwoven polypeptide chains that bind to other myosin molecules
contain two globular protein subunits and will interact with thin filament during contraction forming a crossbridge
Elastic core extending past myosin which recoils after stretching
primary protein of the thin filament
What makes up filamentous actin?
strands of globular actin
Long protein holding the two strands of F-actin together
Long double stranded protein molecule which blocks myosin bind sites on actin when muscles are at rest
What does troponin bind with?
Caclium ions when they become present
Attachment for thin filaments which interconnects neighboring sarcomeres
Repeating functional units of myofilaments extended along myofibrils
Thin filaments only in a sarcomere
Center of I-band where thin filaments are anchored into actinin
Location of thick filaments
Where thick filaments are interspersed with thin filaments
Zone of overlap
Only thick filaments in A band
Middle of H band which connects thick filaments
When skeletal muscle fibers contract the thin filaments slide past thick filaments during contraction
Sliding filament theory
H bands get ___ when contraction occurs
I bands get ___ when contraction occurs
Z lines move _____ when contraction occurs