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My Notes

Mrs eastams Class Notes

TermDefinition
Contractibility Ability of skeletal muscle to shorten with force.
Excitability capacity of skeletal muscle to respond to a stimulus.
Extensibility ability to be stretched.
Elasticity ability to recoil to original resting length after they have been stretched.
epimysium surrounds skeletal muscle and is a connective tissue sheath.
fascia another connective tissue located outside the epimysium. it surrounds and seperates muscles.
perimysium loose connective tissue tht surrounds fasiculi.
fibers single muscle cells
endomysium connective tissue sheath tht surrounds fibers.
myofibrils threadlike structure tht extends from one end of the fiber to the other.
actin myofilaments thin, resemble 2 minute strands of pearls twisted together.
myosin myofilaments thick, resemble bundles of minute golf clubs.
sarcomeres highly ordered units which are joined end to end to form the myofibril.
resting membrane potential charge difference across the membrane.
action potential the brief reversal back of the charge.
motor nuerons nerve cells that carry action potentials to skeletal muscle fibers.
belly portion of muscle between the origin and the insertion
Erector spinae of muscles on each side of the back
Thoracic Muscles muscles that move the thorax
Diaphragm accomplishes quiet breathing
Trapezius rotates scapula
Serratus anterior pulls scapula anteriorly
Pectoralis major adducts and flexes the arm
Latissimus dorsi medially rotates, adducts, and powerfully extends the arm
Biceps brachii flexes the forearm
Triceps brachii extends the forearm
Brachialis flexes forearm
Brachioradialis flexes and supinates the forearm
Retinaculum strong band of fibrous connective tissue that covers the flexor and extensor tendons
Flexor carpi flexes the wrist
Extensor carpi extends the wrist
Flexor digitorum flexes the fingers
Extensor digitorum extends the fingers
the intrinsic hand muscles 19 hand muscles
Gluteus maximus buttocks
Gluteus medius hip muscle and common injection site
Quadriceps femoris extends the leg
Sartorius flexes the thigh
Hamstring muscles flexes the leg and extends the thigh
Gastrocnemius and soleus form the calf muscle
calcaneal tendon Flex the foot and toes
peroneus muscles turning the lateral side of the foot outward
intrinsic foot muscles flex extend, abduct, and adduct the toes
synapse near center of cell
motor unit single motor nueron mujscle fibers
presynaptic terminal space between muscle cell
synaptic vessels secretes synaptic cleft
acetylcholine nuerotransmitter
acetylcholinesterase enzymes tht rapidly breaks down
sliding filament mechanism sliding of actin myofilaments
muscle twitch contraction of entire muscle
threshold point muscle contracts fully
lag phase time between stimulis to motor nueron
contraction phase time of contraction
relaxation phase time which muscle relaxes
tetany muscles remain contracted
recruitment increase in number of motor units
atp needed for energy
atp produced in mitochondria
atp short lived
atp unstable
atp degenerates to more stable adp
creatine phosphate high energy molecule
anaerobic respiration without oxygen
aerobic respiration with oxygen
oxygen dept amount of oxygen needed for chemical reaction
muscle fatigue mucles tire faster than oxygen can b produced
isometric equal distance
isotonic equal tension
muscle tone constant tension of muscles
origin head
insertion end of muscle undergoing most work
belly between origin and insertion
synergists muscles tht work together
antagonist muscles tht work in opposition
prime mover a muscle tht plays as the major role
Created by: jhouts1587
 

 



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