Muscular System Flashcards
Fascia
Connective tissue surrounds bones and muscles
Epimysium
Inner layer of fascia directly surrounds the muscle
(Deep fascia)
Fascicles
Largest bundles of fiber in the muscle.
Surrounded by perimysium
Perimysium
Tissue that surrounds fascicle
Endomysium
Wraps around individual muscle fibers in the fascicle
Order of muscle fibers
Epimysium
Perimysium
Fascicle
Endomysium
Muscle fiber
Tendon
Muscle to bone
*Strain
Glycogen
Glucose stored in tissue
The storage form of carbs
Myoglobin
Protein based molecule that carries oxygen to muscles
Myofibrils
Where muscle contraction occurs
(Actin &myosin)
Myofilaments
Inside myofibril
Contains actin & myosin
Actin
Thin myofilament produces contraction
Myosin
Thick myofilament that produced contraction
Sarcomere
The unit that contains actin and myosin where the actual contraction occurs.
Z line
Meeting point of each sarcomere
Neuromuscular junction
Where nervous system talks to muscle fibers
Synapse
Small gap between motor neuron and muscle
Action potential
Nerve impulse from CNS thru PNS into muscle across neuromuscular junction
Neurotransmitters
Chemical messenger that crosses the synapse between neuron and muscle
Acetylcholine
Helps with action potential cross the synapse
Sliding filament theory
The steps of actin (thin) and myosin (thick) slide pass each other to cause contraction.
*shortening the sarcomere
Excitation contraction coupling
The physiological process of muscle contraction
