GLOSSARY

### GLOSSARY

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

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

amenorrhea

cessation of menses

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 in ...

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