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antagonist any muscle that executes the opposite action of the agonist; during the main
action, it lengthens
aponeurosis a broad, flat tendon that attaches to the end of a muscle
appendicular skeleton the portion of the skeleton composed of the arms and legs, pectoral
girdle (scapulae and clavicles), and pelvic girdle (hips)
arthrokinematic motion- the small, generally unseen movements occuring between the
articulating surfaces of joints
articular disc - a ring-shaped piece of fibrocartilage found in many joints of your body,
including the temporomandibular and sternoclavicular joints
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autonomic nervous system (ANS) the part of the peripheral nervous system that acts as a
control system, functioning largely below the level of consciousness and controlling visceral
functions
axial skeleton - the skeleton's center including the cranium, vertebral column, ribs,
sternum, and hyoid bone
axis a line that runs perpendicular to a plane and is the pivot point around which motion
occurs
axon a long projection of a nerve cell that typically conducts electrical impulses away
from the neuron's cell body
balance the even distribution of weight
ball-and-socket joint - a triaxial synovial joint where a spherical surface of one bone fits
into the dish-shaped depression of another bone
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base of support (BOS) the part of your body (often your feet) that is in contact with the
ground, floor, or other supportive surface
brain the center of the nervous system that functions to coordinate sensation, intellect, and
nerve activity
bursa - a small, fluid-filled sack that reduces friction between two structures
cadence the number of steps taken per minute
cardinal planes the three major planes that intersect at the center of the body
cartilaginous joint an amphiarthrotic joint that allows more movement between bones than
a fibrous joint, but less than a synovial joint
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cell the basic structural, functional, and biological unit of all known living organisms
center of gravity (COG) your body's balance point, located just anterior to the level of
your second sacral vertebrae at the midline of the body
central nervous system (CNS) - - the part of the nervous system that integrates the
information that it receives from, and coordinates the activity of, all parts of the body
close-packed position - when a joint's surfaces have the greatest amount of contact, and
the ligaments and joint capsule are taut
collagen fiber a group of naturally occurring proteins found in animals, especially in the
flesh and connective tissues of vertebrates
colloidal a property whereby a material is composed of solid particles suspended in fluid