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47 Cards in this Set

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A band
These are dark bands. They are made of thick myosin filaments which overlap thin actin filaments.
Abduction
What aliens do. No, just kidding, it's a movement of a body part AWAY from the midline.
Actin
thin protein filaments that, with myosin, contracts muscle fibers
Adduction
movment of body part TOWARDS midline
All-or-None response
Muscle fiber or neuron responding completely when exposed to a stimulus
Antagonist
Prime Mover Muscle's Enemy, the one that opposes it
Contraction
In Myofibrils - actin & myosin slide past each other, shortening muscle fiber & pulling on its attachments
Dorsiflexion
bending foot toward shin
Endurance training
continuous vigorous exercise req'ing body consumption of O2 & developing muscle's ability to sustain activity for long time
Extension
Movement increasing angle between parts at join
Fascia
Sheet of fibrous connective tissue, enclosing a muscle
fast fibers
Fatigable. In response to strenuous exercise, these fibers produce new filaments of actin & myosin, diameters of muscle fibers increase, entire muscle enlarges
fatigue
muscle loses ability to contract
flexion
bending parts of a joint so that the angle between them decreases, & the parts come closer together
hypertrophy
enlarging of forefully exercised muscles
hypothermia
subnormal core body temperature below 37° C
I-Band
light bands - made of thin actin filaments attached to z-line
insertion
the end of a muscle attached to a moveable part
isometric contraction
muscle doesn't shorten
isotonic contraction
same tension/pressure
motor neuron
neuron that transmits impulses from central nervous system to an effector
motor unit
motor neuron and its associated muscle fibers
muscle impulse
Impulse that travels along sarcolemma & down transverse tubules
muscle tone
the certain amount of sustained contraction occuring when muscle is at rest
myofibril
contractile fibers within muscle cells
myosin
protein that w/ myosin contracts& relaxes muscle
neurotransmitter
chemical that axon end secretes to control another neuron or an effector
origin
end of muscle that attaches to an immovable part
oxygen debt
amt of oxygen required after physical exercise to convert accumulated lactic acid to glucose
paralysis
loss of ability to move a body part
peristalsis
rhythmic waves of muscular contraction in walls of certain tubular organs
plantar flexion
bending foot at ankle toward sole
posture
position of body
prime mover
muscle responsible for a particular body movement
pronation
downward or backward rotation of palm or hand
rotation
movement turning a body part around a central axis
sarcomere
structural and functional unit of a myofibril
slow fibers
weak contraction; fatigue resistant. With use,these develop more mitochondria & more extensive capillary networks. size & strength = unchanged
stimulus
change in environment that triggers a response from an organism or cell
supination
forearm rotation so palm faces upward when arm is outstretched
synergist
muscle that assists in action of prime mover
tendon
cordlike or bandlike mass of white fibrous connective tissue that connects a muscle to a bone
tetanic contraction
continuous, forceful muscular contraction w/o relaxation
Threshold stimulus
stimulation level that must be exceeded to elecit nerve impulse or muscle contraction
tonic contraction
special - used for posture
twitch
brief muscular contraction followed by relaxation
z Line
where I-bands attach