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anatomy chapter 6

buttocks gluteous maximus
muscle cells muscle fibers
chest muscle pectoral muscle
anterior thigh muscle quadriceps femoris
posterior thigh muscle hamstring muscles
group of muscles on each side of the back erector spinae
ability of skeletal muscle to shorten with force contractility
ability to be stretched extensibility
ability to recoil to the original resting length elasticity
capacity of skeletal muscle to respond to a stimulus excitability
thin myofilamets actin myofilaments
thick myofiments myosin myofilaments
each skeletal muscle is surrounded by this connective tissue sheath epimysium
connective tissue located outside the epimysium fascia
each fiber i surrounded by this connective tissue sheath endomysium
threadlike structure that extends from one fiber to another myofibrils
charge difference across the membrane resting membrane potential
brief reversal back of a charge action potential
nerve cells that carry action potentials to skeletal muscle fibers motor neurons
enlarged nerve terminal presynaptic terminal
space between the presynaptic terminal and the muscle cell synaptic cleft
muscle fiber postsynaptic terminal
secretes acetylcholine synaptic vessicles
neurotransmitter acetylcholine
i bands consist of actin
h bands consist ony myosin
sliding of actin filaments past myosin filaments during contraction sliding filament mechanism
contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers muscle twitch
where the muscle remains contracted without relaxing tetany
where ATP is produced mitochondria
without oxygen anaerobic respiration
with oxygen aerobic respiration
results when ATP is used during muscle contraction faster than it can be produced in the muscle cells muscle fatigue
length of the muscle does not change, but the mount of tension increases during the contraction process isometric
length of the muscle changes, but the amount o tension being produced by the muscle is constant during contraction isotonic
contract quickly and fatigue quickly fast-twitch fibers
contract more slowly and are more resistant to fatigue slow-twitch fibers
points of attachment of each muscle origin and insertion
most stationary end of the muscle origin(head)
end of the muscle undergoing the greatest movement insertion
portion of the muscle between the origin and the insertion belly
muscles that work together to accomplish specific movements synergists
muscles that work in opposition to one another antagonists
one muscle that plays the major role in accomplishing the desired movement prime mover
joined end to end to form a myofibril sarcomeres
raises the eyebrows occipitofrontalis
closes the eyelids and causes "crows feet" wrinkles in the skin orbicularis oculi
puckers the lips orbicularis oris
flattens the cheeks buccinator
kissing muscles orbicular oris and buccinator
smiling muscle zygomaticus
sneering levator labii superioris
frowning depressor anguli oris
chewing mastication
4 pairs of mastication muscles 2 pair of pterygoids, temporalis, and masseter
change the shape of the tongue intrinsic tongue muscles
move the tongue extrinsic tongue muscles
lateral neck muscle and prime mover sternocleidomastoid
most involved in breathing external intercostals and internal intercostals
elevate the ribs during inspiration external intercostals
contract during forced expiration internal intercostals
accomplishes quiet breathing diaphragm
area of abdominal wall that consists of white connective tissue rather than muscle linea alba
rotates scapula trapezius
pulls scapula anteriorly serratus anterior
the arm is attached to the thorax by the pectoralis major and lattissimus dorsi muscles
adducts and flexes the arm pectoralis major
medially rotates, adducts, and powerfully extends the arm "swimmer muscles" latissimus dorsi muscles
attaches the humerus to the scapula and clavicle, and is the major abductor of the upper limb deltoid
extends the forearm occupies the posterior compartment of the arm triceps brachii
flexes the forearm occupies the anterior compartment of the arm biceps brachii
flexes forearm brachialis
flexes and supinates the forearm brachioradialis
strong band of fibrous connective tissue that covers the flexor and extensor tendons and holds them in place around the wrist so that they do not "bowstring" during muscle contraction retinaculum(bracelet)
flexes the wrist flexor carpi
extends the wrist extensor carpi
flexes the fingers flexor digitorum
extends the fingers extensor digitorum
19 hand muscles located in the hand intrinsic hand muscles
located between the metacarpals responsible for abduction and adduction of the fingers interossi muscles
hip muscle and common injection site gluteus medius
"tailors muscle"; flexes the thigh sartorius
form the calf muscle gastrocnemius and soleus
calcaneal tendon Achilles tendon
lateral muscles of the leg peroneus muscles
20 muscles located within the foot intrinsic foot muscles
what do intrinsic foot muscles do flex extend, abduct, and adduct the toes
Adenosine triphosphate ATP
Adenosine diphosphate ADP
Created by: mirandague



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