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Ch.6 Skeletal Muscle

Ch.6 Skeleta lMuscle

ability to shorten with force contractility
the capacity to respond to a stimulus excitability
the ability to be stretched extensibility
ability to recoil to the original resting length elasticity
each skeletal muscle is surrounded by a connective sheath called epimysium
another connective tissue located outside the epimysium, surrounds and separates muscle fascia
muscle is composed of bundles called fascicle
fascicle is surrounded by a loose connective tissue called perimysium
muscle cells fibers
surrounds each muscle fiber endomysium
cytoplasm of each fiber myofibrils
thin myofilaments. 2 strands of pearls twisted together actin myofilaments
thick myofilaments. bundles of minute golf clubs myosin myofilamentd
actin and myosin myofilaments form highly ordered units called sacromeres
nerve cells that carry action potentials to skeletal muscle fibers motor neurons
branch that connects to the muscle forms a synapse
single motor neuron motor unit
enlarged nerve terminal presynaptic terminal
the space between the presynaptic terminal and the muscle cell synaptic cleft
secretes acetylcholine synaptic vesicles
acetylcholine movement juice
acetycholinesterase non movement juice
contraction of an entire muscle muscle twitch
a muscle fiber will not respond to stimulus to a motor neuron and beginning of a contraction lag phase
muscle flexes without relaxing tetany
increase in number of motor units being activated recruitment
energy needed for muscle contraction, produced in mito., short lived ATP
more stable energy ADP
Energy when ATP is low creatine phosphate
without oxygen anaerobic respiration
with oxygen aerobic respiration
the amount of oxygen needed in chemical reactions oxygen debt
when ATP is used up quicker than it is being produced muscle fatigue
Type of muscle contraction when you're holding a ball isometric
type of muscle contraction when you throw a ball isotonic
tension used to hold your head up Muscle tone
muscle for sprinters and chicken breast Fast-twitch fibers
muscle for long distance and chicken legs Slow-twitch fibers
stationary end of the muscle origin (head)
end of the muscle undergoing the greatest movement insertion
part of the muscle between the origin and insertion belly
muscles that work together to accomplish specific movements synergists
muscles that work in opposition to one another antagonists
one muscle in a group of synergists that plays the major role in movement prime mover
raises the eyebrows occipitofrontalis
closes the eyelids and causes "crows feet" orbicularis oculi
puckers the lips orbicularis oris
flattens the cheek buccinator
smiling muscle zygomaticus
sneering levator labii superioris
frowning depressor anguli oris
4 pairs of mastication muscles 2 pairs of pterygoids, temporalis, and masseter
changes the shape of the tongue intrinsic tongue muscles
move the tongue extrinsic tongue muscles
lateral neck muscle and prime mover. rotates and adducts the head sternocleidomastoid
downward sag of the mouth platysma
keeps the body erect and straight erector spinae
muscles that move the thorax thoracic muscles
most involved in breathing external and internal intercostals
elevate the ribs during inspiration external intercostals
contract during forced expiration internal intercostals
dome shaped, quiet breathing diaphram
vertical indention from naval to pubis linea alba
each side of the linea alba rectus abdominis
crosses the rectus abdominis, creating sections (abs) tendinous inscriptions
rotates scapula trapezius
pulls scapula anteriorly (in front of) serratus anterior
attatches the arm to the thorax pectoralis major and latissimus dorsi muscles
adducts and flexes the arm pectoralis major
medially rotates, adducts, and extends the arm (swimmer muscles) latissimus dorsi
attaches the humerus to the scapula and clavical deltoid
extends the forearm (posterior) triceps brachii
flexes the forearm (anterior) biceps brachii
flexes forearm brachialis
flexes and supinates the forearm brachioradialis
flexor and extensor tendons around the wrist retinaculum (bracelet)
flexes the wrist flexor carpi
extends the wrist extensor carpi
flexes the fingers flexor digitorum
extends the fingers extensor digitorum
intrinsic hand muscles
responsible for abduction and adduction of the fingers, between the metacarpols interossi
buttocks gluteus maximus
hip muscle gluteus medius
extends the leg, anterior thigh muscles quadriceps femoris
flexes the thigh, tailors muscle sartorius
flexes the leg and extends the thigh hamstring
calf muscle gastrocnemius and soleus
flex the foot and the toes achilles tendon
turns the foot outwards peroneus
20 muscles in the foot intrinsic foot muscles
Created by: Ashleemae