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Buttocks Gluteus Maximus
Contractility ability to shorten with force
Excitability capacity to respond to a stimulus
Extensibility ability to be stretched
Elasticity recoil to natural length after being stretched
Epimysium connective tissue sheath surrounded by each muscle
Fascia connective tissue located outside the epimysium
Perimysium loose connective tissue surrounding a fascicle
Fibers single muscle cells
Endomysium connective tissue sheath surrounding each fiber
Myofibrils threadlike structure that extends from one end of the fiber to the other
Actin myofilaments thin myofilaments
Myosin myofilaments thick myofilaments
Sarcomeres joined end to end to form the myofibril
Resting membrane potential charge difference across the membrane
Action potential brief reversal back of the charge
Motor neurons nerve cells that carry action potentials to skeletal muscle fibers
neuromuscular junction Each branch that connects to the muscle forms
motor unit single motor neuron and all the skeletal muscle fibers it innervates
occipitofrontalis raises eyebrows
orbicularis oculi closes eyelids
orbicularis oris puckers the lips
buccinator flattens cheek
zygomaticus smiling muscle
levator labii superioris sneering
depressor anguli oris frowning
mastication chewing
sternocleidomastoid neck muscle
diaphragm slow breathing
Triceps brachii extends forearm
Biceps brachii flexes the forearm
brachialis flexes forearm
brachioradials flexes and supinates forearm
flexor carpi flex wrist
extensor carpi extends wrist
flexor digitorum flex fingers
extensor digitorum extends fingers
synaptic cleft space between presynaptic cleft and muscle cells
presynaptic cleft nerve terminal
synaptic vesicle surrounds the terminal
acetylcholine neurotransmitter
acetylcholinesterase The acetylcholine released into the synaptic cleft between the neuron and muscle cell is rapidly broken down by an enzymes
sliding filament mechanism The sliding of actin myofilaments past myosin myofilaments during contraction
Muscle twitch is a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers.
threshold A muscle fiber will not respond to stimulus until that stimulus reaches a level
all-or-none response at which point the muscle fiber will contract maximally
lag phase The time between application of a stimulus to a motor neuron and the beginning of a contraction is the
contraction phase where the muscles contract
relaxation phase where the muscles relax
Tetany contracted without relaxing
recruitment increase in motor units
creatine phosphate produced for muscle cells
Anaerobic respiration no oxygen
Aerobic respiration oxygen
oxygen debt lack of oxygen
Muscle fatigue muscles giving out
isometric muscle length does not change
isotonic length changes
Muscle tone refers to constant tension produced by muscles of the body for long periods of time
Fast-twitch fibers fast muscles twitch
Slow-twitch fibers slow muscle twitch
origin most stationary end of muscle
insertion undergoing greatest movement
belly between origin and insertion
synergists work together
antagonists work against
prime mover one muscle works to move others
sliding filament mechanism The sliding of actin myofilaments past myosin myofilaments during contraction
acetylcholinesterase The acetylcholine released into the synaptic cleft between the neuron and muscle cell is rapidly broken down
External intercostals elevate the ribs during inspiration
Internal intercostals do not elevate ribs
diaphragm accomplishes quiet breathing
rectus abdominis On each side of the linea alba
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, and is the major abductor of the upper limb.
Created by: jdixon21