Chapter 1 Flashcards
Functions of skeletal muscle
force production for locomotion, breathing, postural support, heat production
flexors
decrease joint angle
extensors
increase joint angle
fiber
muscle cell, long, slender, multinucleated
connective tissue layers
epimysium, perimysium, endomysium
tendons
tissue connecting muscle to periosteum of bone
epimysium
surrounds all the bundles to form the entire muscles
perimysium
surrounds several fibers and forms bundles called fasciculi
endomysium
wraps around each fiber
origin of tendon
more stable bone
insertion of tendon
moving bone
sacrolemma
muscle cell membrane
satelite cells
muscle growth and repair
myonuclear domain
cytoplasm surrounding each nucleus
what does more nuclei do?
allow for greater protein synthesis, important for adaptations to strength training
sacroplasmic reticulum
extensive lattice like network and vesicles
SR function
provides structural integrity, storage for calcium, terminal cisternae
transverse tubules
extend from sacrolemma to SR
Myofibrils
contain contractile proteins
sacromere
basic contractile element of skeletal muscle, end to end, Z line to Z line
myofibrils
in muscle fiber
actin
thin, I band, A band
myosin
thick, globular head, A band, H zone
function of actin
myosin binding site
tropomyosin
covers active site
troponin
anchored to actin and moves tropomyosin
titin
third myofilamnet, acts as spring, Z-disk to M-band
neuromuscular junction
junction between motor neuron and muscle fiber
motor unit
motor neuron and all fibers it innervates
motor end plate
pocket formed around motor neuron by sacrolemma
Ach
released from motor neuron that causes EPP
