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Chapter 6 - Muscles

Chapter 6 - Muscular System (Anatomy)

Muscle Cells Muscle Fibers
Buttocks Gluteus Maximus
Chest Muscle Pectoral Muscle
Anterior thigh muscle Quadriceps femorals
Posterior thigh muscle hamstring
Back Muscle latissumus
Contractility the ability of skeletal muscle to shorten with force
Excitability the capacity of skeletal muscle to respond to a stimulus
Extensibility the ability to be stretched
Elasticity ability to recoil back to the original length after being stretched
Produces Heat Muscles
Epimysium Surrounds the skeletal muscle
Fascia Surrounds the epimysium
Muscle Fasciculi bundles
Perimysium Surrounds the fascicle
Muscle Fiber a sing cylindrical, multi nuclei
Endomysium surrounds fiber
Myofibrils the cytoplasm of each fiber
Actin Myofilaments thin myofilaments
Myosin Myofilaments thick myofilaments
Sarcomeres units formed by actin and myosin myofilaments
Sacromere basic structural and functional unit
action potential the brief reversal back of the charge
motor nuerons nerve cells that carry action potentials to skeletal muscle fibers
Resting Membrane Potential the charge difference across the membrane
synapse made from each branch connecting to the muscle
neuromuscular junction synapse
motor unit a single motor nueron
presynaptic terminal an enlarged nerve terminal
synaptic cleft the space between the presynaptic terminal and muscle cell
postsynaptic cleft muscle fiber
synaptic vesicle in each presynaptic terminal
acetylcholine secrete a neurotransmitter
acetylcholinesterase enzymes that release muscles cells
sliding filament mechanism the sliding of actin past myosin
muscle twitch a contraction of an entire muscle
threshold a muscle fiber will not respond to stimulus
all-or-none response when a muscle contracts maximally
lag phase the time between application of a stimulus to a motor neuron and the beginning of a contraction
contraction phase the time of contration
relaxation phase the time during a muscles relaxes
tetany where the muscle stays contracted and doesn't relax
recuritment the increase in number of motor units
ATP the need for energy for muscle contraction
ATP is produced _______. in the mitochondria
ATP is ____. Short-lived and unstable
creatine phosphate can't stockpile ATP but can store other high-energy molecules
anaerobic respirtaion without oxygen
aerobic respiration with oxygen
oxygen debt the amount of oxygen needed in chemical reactions
muscle fatigue when ATP is used during muscle contraction
isometric the length of muscle does not change
isotonic the amount of tension produced by the muscle
muscle tone constant tension produced by muscles of the body
fast-twitch fiber contract quickly and fatigue quickly
slow-twitch fiber contract more slowly and more resistant to fatigue
oorigin the most stationary end of the muscle
insertion the end of the muscle undergoing the most movement
belly between the head and insertion
synergists muscles that work together to complete movement
antagonists muscles that work in opposition to one another
prime mover a muscle that plays a major role in movement
occipitalfrontalis raises eyebrows
orbicularis oculi closes the eyelids
orbicunlaris oris puckers lips
bussinator flattens the cheeks
zygomaticus smiling muscles
levator labii superioris sneering
depressor anguli oris frowning
pairs of muscles for cheeks pterygoids, temporalis, massester
changes the shape of the tongue intrinsic tongue muscles
moves the tongue extrensic tongue mucles
neck muscle sternocleidomastoid
sternocleidomastoid lateral neck muscle and prime mover
Erector spinae a group of muscles on each side of the back
Created by: adamspaulding



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