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muscles study stack

contractility the ability of skeletal muscles to shorten with force
excitability the capacity of a skeletal muscle to respond to a stimulus
extensibilty ability to be stretched
elasticity ability to recoil to their original resting length after being stretched
epimysium connective tissue sheath surrounding skeletal muscles
fascia connective tissue located outside the epimysium
fasiculi bundled cells that create the muscle
perimysium loose connective tissue surrounding the fasiculi
fibers makes up the fasiculi
endomysium connective tissue sheath surrounding each fiber
myofibrils threadlike structure that extends from one end of the fiber to the other
actin myofillaments thin myofilaments resembling 2 minute strands of pearls
myosin myofilament thick myofilaments resembling bundles of minute golf clubs
sarcomeres unit formed by actin and myosin myofilaments
resting membrane potential the charge difference between the inside and the outside of the cell membrane
action potential the brief reversal back of the charge
motor neurons nerve cells that carry action potentials to skeletal muscle fibers
neuromuscular junction (synapse) where the axon connects to the muscle
motor unit single motor neuron and all the skeletal muscle fibers it innervates
presynaptic terminal enlarged nerve terminal
synaptic cleft the space between the presynaptic terminal and the muscle cell
postsynaptic terminal the muscle fiber
synaptic vessicles secrete a neurotransmitter and is located in the presynaptic terminal
acetylcholine the neurotransmitter
acetylcholinesterase an enymatic breakdown
sliding filament mechanism the sliding of actin myofilaments past myosin myofilaments
muscle twitch contraction of an entire muscle
threshold the level a muscle fiber can begin to react
lag phase beginning of a muscle contraction
contraction phase time of a contraction
relaxation phase time which the muscle relaxes
tetany where the muscle remains contracted without relaxing
recruitment increase in number of motor units being activated
creating phosphate high-energy molecule
anaerobic respiration without oxygen
aerobic respiration with oxygen
oxygen debt the amount of oxygen needed in chemical reactions
muscle fatigue when ATP is used during muscle contraction faster than it can be produced
isometric length does not change, but the amount of tension increases
isotonic the tension produced by the muscle is constant but the length of the muscle changes
muscle tone constant tension produced by muscles of the body for long periods of time
fast twitch fibers contract quickly and fatigue quickly
slow twitch fibers contract slowly and more resistant to fatigue
origin most stationary end of the muscle
insertion end of the muscle undergoing the greatest movement
belly portion of the muscle between the origin and insertion
synergists muscles that work together
antagonists muscles that work in opposition to eachother
prime mover plays a major role in accomplishing the desired movement
frontalis raises eyebrows
orbicularis oculi blinks and closes eye
orbicularis oris closes and protrudes lips
temporalis closes jaw
zygomaticus raises corner of the mouth
masseter closes jaw
buccinator compresses cheek
sternocleidomastoid flexes neck and rotates head
platysma pulls corner of the mouth
pectoralis major adducts and flexes humerus
rectus abdominus flexes vertebral column
external oblique flexes and rotates vertebral column
biceps branchii flexes elbow and supinates forearm
branchialis flexes elbow
deltoid abducts arm
lliopsoas flexes hip
adductor muscles adduct thigh
sartiorius flexes thigh on hip
quadriceps group all extend knee
tibialis anterior dorsiflexes and inverts foot
extensor digitorium longus extends toes and dorsiflexes foot
fibularis muscles plantar flex and evert foot
gastrocnemius two bellied muscles that form the ecalf
soleus fleshy muscle deep in the gastrocnemius
trapezius the most superficial muscles of the posterior neck and upper trunk
deltiod fleshy triangle shaped muscles that form the rounded shape of the shoulders
Created by: hoodedgalaxy172