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acromioclavicular joint irregular joint between the acromion process of the scapula and the distal clavicle
active insufficiency condition occurring when a two-joint muscle cannot shorten enough to cause full range of motion at both joints it crosses at the same time
active stretching stretching of muscles, tendons, and ligaments produced by active development of tension in the antagonist muscles
acute loading application of a single force of sufficient magnitude to cause injury to a biological tissue
agonist role played by a muscle acting to cause a movement
anatomical reference position erect standing position with all body parts, including the palms of the hands, facing forward; considered the starting position for body segment movements
angle of attack angle between the longitudinal axis of a body and the direction of the fluid flow
angle of projection the direction at which a body is projected with respect to the horizontal
angular involving rotation around a central line or point
angular acceleration rate of change in angular velocity
angular displacement change in the angular position or orientation of a line segment
angular impulse change in angular momentum equal to the product of torque and time interval over which the torque acts
angular momentum quantity of angular motion possessed by a body; measured as the product of moment of inertia and angular velocity
angular velocity rate of change in the angular position or orientation of a line segment
anisotropic exhibiting different mechanical properties in response to loads from different directions
annulus fibrosus thick, fibrocartilaginous ring that forms the exterior of the intervertebral disc
antagonist role played by a muscle acting to slow or stop a movement
anthropometric related to the dimensions and weights of body segments
apex the highest point in the trajectory of a projectile
appendicular skeleton bones composing the body appendages
Archimedes' principle physical law stating that the buoyant force acting on a body is equal to the weight of the fluid displaced by the body
articular capsule double-layered membrane that surrounds every synovial joint
articular cartilage protective layer of dense white connective tissue covering the articulating bone surfaces at diarthrodial joints
articular fibrocartilage soft-tissue discs or menisci that intervene between articulating bones
average occurring over a designated time interval
axial directed along the longitudinal axis of a body
axial skeleton the skull, vertebrae, sternum, and ribs
axis of rotation imaginary line perpendicular to the plane of rotation and passing through the center of rotation
balance a person's ability to control equilibrium
ballistic stretching a series of quick, bouncing-type stretches
base of support area bound by the outermost regions of contact between a body and support surface or surfaces
bending asymmetric loading that produces tension on one side of a body's longitudinal axis and compression on the other side
Bernoulli principle an expression of the inverse relationship between relative velocity and relative pressure in a fluid flow
biomechanics application of mechanical principles in the study of living organisms
bone atrophy decrease ...

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