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ch. 6 muscles

occipitofrontalis raises the eyebrows
orbicularis oculi closes the eyelids
orbicularis oris puckers the lips
buccinator flattens the cheeks
zygomaticus smiling muscle
levator labii superioris sneering
depressor anguli oris frowning
mastication chewing
mastication muscles temporalis and masseter
intrinsic tongue muscles changes the shape of the tongue
extrinsic tongue muscles moves the tongue
neck muscle sternocleidomastoid
trunk muscles erector spinae
erector spinae group of muscles on each side of the back
thoracic muscles muscles that move the thorax
external intercostals elevate the ribs during inspiration
internal intercostals contract during forced expiration
the tendinous area of the abdominal wall is called what? linea alba
on each side of the linea alba is what muscle? the rectus abdominis
what causes the abdominal wall of a well-muscled person to appear segmented? tendinous inscriptions
trapezius rotates scapula
serratus anterior pulls scapula anterior
the arm is attached to the thorax by the? pectoralis major & latissimus dorsi muscles
pectoralis major adducts and flexes the arm
latissimus dorsi medially rotates, adducts, and powerfully extends the arm
deltoid attaches the humerus to the scapula and clavicle
triceps brachii extends the forearm
biceps brachii flexes the forearm
brachialis flexes forearm
brachioradialis flexes and supinates the forearm
flexor carpi flexes the wrist
extensor carpi extends the wrist
flexor digitorum flexes the fingers
extensor digitorum extends the fingers
intrinsic hand muscles 19 hand muscles
gluteus maximus buttocks
gluteus medius hip muscle
quadriceps femoris extends the leg; anterior thigh muscle
sartorius "tailors muscle"; flexes the thigh
hamstring muscles posterior thigh muscles;flexes the leg and extends the thigh
form the calf muscle gastrocnemius and soleus
they join to form what tendon? calcaneal tendon
calcaneal tendon or achilles tendon flexes the foot and toes
the lateral muscles of the leg peroneus
20 muscles located within the foot intrinsic foot muscles
four major functional characteristics of muscles contractility, excitability, extensibility, elasticity
the ability of skeletal muscle to shorten with force contractility
the capacity of skeletal muscle to respond to a stimulus excitability
the ability to e stretched extensibility
ability to recoil to their original resting length after they have been stretched elasticity
each skeletal muscle is surrounded by a connective tissue sheath called the? epimysium
another connective tissue located outside the epimysium fascia
each fiber is surrounded by a connective tissue sheath called the? endomysium
actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
actin and myosin myofilaments form highly ordered units called sarcomeres
each sarcomere extends from? one Z line to another Z line
The charge difference across the membrane is called the? resting membrane potential
the brief reversal back of the charge is called? action potential
nerve cells that carry action potentials to skeletal muscle fibers motor neurons
neuromuscular junction synapse
the enlarged nerve terminal is called? presynaptic terminal
each presynaptic terminal contains: synaptic vesicles
synaptic vesicles secrete a neurotransmitter called? acetylcholine
acetylcholine is broken down by acetylcholinesterase
a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers is a? muscle twitch
where the muscle remains contracted without relaxing is called? tetany
ATP can store anther high-energy molecule called? creatine phosphate
anaerobic respiration without oxygen
aerobic respiration with oxygen
what results when ATP is used during muscle contraction faster than it can be produced? muscle fatigue
length of the muscle does not change but the amount of tension increases isometric
amount of tension produced by the muscle is constant during contraction but the length of the muscle changes isotonic
fast-twitch fibers contract quickly and fatigue quickly
slow-twitch fibers contract more slowly and are more resistant to fatigue
origin most stationary end of muscle
insertion undergoes the greatest amount of movement
between origin and insertion belly
muscles that work together to accomplish specific movements synergists
muscles that work in opposition to one another antagonists
plays the major role in accomplishing the desired movement prime mover
Created by: kelseybug



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