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Chapter 6 Muscle

QuestionAnswer
What are the four major functional characteristics of skeletal muscles? Contractility, Excitability, Extensibility, and Elasticity
The ability of skeletal muscles to shorten with force contractility
responds to stimulus excitability
outermost connective tissue extensiblity
inside the fascia, second layer of connective tissue fascia
bundle of muscle cells epimysium
surrounds each fascicle muscle fasicle
thin myofiliaments, peals actin myofilaments
thick myofiliaments, golf clubs myosin myofilaments
basic unit of muscle sarcomeres
thin line of actin, starts and finishes sacomeres z line
on both sides of z line, light area, actin l band
dark area of sarcomere, myosin a band
between a zones, myosin H zone
raises the eyebrow occipitofrontalis
closes the eyelids orbicularis oculi
puckers the lips orbiculais oris
flattens the cheeks buccinator
smiling zygomaticus
sneering levator labii superioris
frowning depressor anguli oris
chewing mastication
2 pairs of pterygoids, temporalis, and masseter mastication muscles
change the shape of the tongue instrinic muscles
moves the tongue extrinic muscles
rotates and abducts head, prime mover sternocleidomastoid
group of muscles that keep the back straight and the body erect erector spinae
accomplishes quiet breathing diaphragm
rotates scapula trapezius
pulls the scapula anteriorly serratus anteriorly
abducts and flexes the arm pectoralis major
extends arm powerfully, rotates, and adducts the arms latissimus dorsi
attaches the humerus to the scapula and clavicle deltoid
extends the forearms triceps brachii
flexes the forearm biceps brachii
flexes and supinates the forearm brachialis
flexes the wrist flexor carpi
extends the wrists extensor carpi
flexes the fingers flexor digitorum
extends the fingers extensor digitorum
buttocks gluteus maximus
hip muscles gluteus medius
extends the legs, anterior thigh muscle quadriceps femoris
flexes the thigh sartorius
posterior thigh muscle, flexes the legs and extends the thigh hamstring
dark line down the center, myosin M line
nerve cells that carry action potential to muscle motor neurons
each branch of an axon that connects to the muscle neuromuscular junction/ synapse
enlarged nerve terminal presynaptic terminal
space between presynaptic and the muscle synaptic vesicles
the muscle fiber touching the synaptic cleft acetylcholine
secrete neurotransmitters acetylcholinesterase
neurotransmitters from the synaptic vesicle acetylcholine
makes sure that only one action potential is sent to the motor neuron acetylcholinesterase
sliding of actin and myosin during contraction sliding filament mechanism
contraction of an entire muscle responding to stimulus that causes the action potential in one or more muscle fibers muscle twitch
muscle fiber will not respond until the stimulus threshold
the time between application of stimulus and the beginning of contraction lag phase
ATP energy needed for muscle contraction
increase in number of motor units being activated recruitment
center light area in the H zone
H zone only myosin
outside cell membrane positively charged
inside cell membrane negatively charged
resting membrane potential charge difference
action potential the reversal back for the charge
motor neurons nerve cells carry action to muscle fibers
synapse center of the cell
neuron muscular junction branch that connects to the muscle
postsynaptic terminal enlarged nerve terminal
synaptic vessels each presynaptic terminal
actin and myosin myofilaments 2 kinds of protein fibers
synaptic cleft spaces between presynaptic and muscle cell
True True or false: you have to have ATP for a muscle to contract
False True or false: There is 3 different types of protein fibers
Created by: Kassidy.liane