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Anatomy Ch. six


The ability of skeleal muscles to shorten with force Contractility
The capacity of skeletal muscles to respond to a stimulus Excitability
The ability to be stretched Extensibility
The ability to recoil to original form Elasticity
Tissue sheath that surrounds the skeletal muscle Epimysium
The tissue located on the ouside of the epimysium Fascia
The muscle composed of numerous visibel bundles Fasciculi (Fascicle)
The loose connective tissue that surrounds the fascicle Perimysium
The fasciuli are composed of single cells called? Fibers
The connective tissue sheath that surrounds the fiber Myofibils
thin myofilaments actin
thick myofilaments myosin
The highly ordered units that actin and myosin form sarcomreres
each sarcomrere extends from _ to _ Z line
light area on each side of the Z line I band
extends the length of myosin A band
center of each sarcomere (light area) H zone
dark line of myosin M line
the charge difference across the membranes resting membrane potetial
breif reversal back of the charge action potential
nerves that carry action potential to skeletal muscle fibers motor neurons
each branch connects to make.... nueuromuscular junction (synapse)
A single motor neuron and all the skeletal muscle fibers it intervates motor unit
Enlarged nerve Presynapstic terminal
the space between the presynaptic terminal and the muscle cell synaptic cleft
the muscle fibers synaptic vescles
neurotransmitter acetylchline
enzyme that breaks down the muscle cells acetylcholinesterase
the sliding of actin myofilaments past myosin myoflaments during contraction slidding filament mechanism
the contraction of a muscle in respons to a stimmulus muscle twitch
The level at whitch muscle fibers respond threshold
when the muscles contrct maximally all-or-none response
the me between application of a stimulus to s motor neuron and the beining of a contraction lag phase
when the muscles relax relaxtion phase
When the muscle remains contracted without relaxing tetany
the increase of number of motor units being activated recruitment
ATP adenosine triphosphate
produced in the mitochondria ATP
ADP adenosine diphosphate
hih energy molecule creatine phosphate
without oxygen anerobic respiration
with oxygen aerobic respiration
the amount of oxygenneed for a chemical reaction to take place oxygen debt
when ATP is used faster than is produced muscle fatigue
equal distance isometric
equal tension isotonic
th constant tention produced by muscles of the body for lon periods of time. muscle tone
contract quickly and fatiue faster fast-twitch fibers
contracts slowly slow-teitch fibers
the points of attatchment of each muscle oriin and insertion
most stationary end of the muscle oriin (head)
the end of the muscle that underoes that most tention insertion
between the insertion and the origin belly
muscles tat work toggether to accomplish a spacific movement synergists
muscles that work in opposition o one another antagonist
if one muscle plays a major role in accomplishing the desired movement prime mover
occipito fontalis raises eyebrows
orbicularis oculi opens and closes eye lids
orbicularis oris pucers lips
buccinator flattens cheeks
zyomaticus smilling
levitor labai superiouris sneering
deprssor anuli oris frowning
mastication act of chewing
temporalis chewing
masseter chewing
extrinsic moves tongue
intrinsic changes the shape of the tongue
diaphram dome shaped muscle
external oblique abdominalis
Created by: Tab_Step



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