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zaina assi

chapter 6 muscles

muscle cells muscle fibers
muscle responsible for smiling zygomaticus
contractility the ability of skeletal muscle to shorten with force
fascia? located outside the epimysium. it surrounds and separates the muscle.
excitability the capacity of skeletal muscle to respond to a stimulus.
extensibility the ability to be stretched
elasticity ability to recoil to their original resting length after they have been stretched
perimysium loose connective tissue that surrounds the fascicle.
endomysium the fiber surrounded by the connective tissue.
myofibrils a threadlike structure that extends from one end of the fiber to the other.
actin myofilaments thin myofilaments that resemble 2 minute strands of pearls twisted together.
myosin myofilaments thick myofilaments that resemble bundles of minute golf club.
sarcomeres actin and myosin myofilaments that form highly ordered units.
resting membrane potential the charge difference across the membrane.
action potential the brief reversal back of the charge.
motor neurons nerve cells that carry action potentials to skeletal muscle fibers.
motor unit a single motor neuron and all the skeletal muscle fibers innervates.
the space between the presynaptic terminal and the muscle cell is the? synaptic cleft
each presynaptic terminal contains? synaptic vesicles
what happens when the sarcomeres shorten? it causes the muscle to shorten.
muscle twitch is a contraction of an entire muscle in response to a stimulus that causes the action potential i one or more muscle fibers.
when a muscle fiber does not respond to stimulus that stimulus reaches a level called? threshold
all-or-none response the point where the muscle fiber will contract maximally.
lag phase the time between application of a stimulus to a motor neuron and the beginning of a contraction.
a high energy molecule that can be quickly used to produce ATP creatine phosphate
cardiac muscle is under involuntary control
buttocks gluteus maximus
the eyebrow muscle is the orbicularis oculi
anterior high muscle that extends the leg is the quadriceps femoris
muscle twitch is a contraction of an entire muscle in response to a stimulus
the time of contraction is the contraction phase
the muscles that relaxes is the relaxation phase
tetany the condition where a muscle remains contraction without relaxing
aerobic resperation occurs in the presence of oxygen
anerobic repiration occurs in the absence of oxygen
two types of muscle contractions isotonic and isometric
the most stationary end of a muscle head
two types of tongue muscles intrinsic and extrinsic
Created by: zaina17



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