How can we help?

You can also find more resources in our Help Center.

26 terms

Muscular System

Muscular System - Health Science Technology
STUDY
PLAY
muscles
bundles of muscle fibers held together by connective tissue
excitability
irritability, the ability to respond to a stimulus such as a nerve impulse
contractibility
muscle fibers that are stimulated by nerves contract, become short and thick, which causes movement
extensibility
the ability to be stretched
elasticity
allows the muscle to return to its original shape after it is contracted or stretched
cardiac muscle
forms the walls of the heart and contracts to circulate blood - involuntary
visceral - smooth muscle
found in the internal organs of the body
skeletal muscle
attached to bones and causes body movement - voluntary
tendons
strong, tough, fibrous connective tissue cords - attach muscles to bones
fascia
tough sheetlike membrane that covers and protects
origin
the part of tha skeletal muscle that is attached to a fixed structure or bone
insertion
attached to a moveable part; the part that moves most during muscle contraction
belly
the central body of the muscle
adduction
moving a body part toward the midline
abduction
moving a body part away from the midline
flexion
decreasing the angle between two bones or bending a body part
rotation
turning a body part around its own axis
circumduction
moving in a circle at a joint, or moving one end of a body part in a circle while the other end remains stationary
muscle tone
state of partial contraction, also described as a state of readiness to act
muscle atrophy
muscles shrink in size and lose strength
contracture
caused by lack of use, a severe tightening of a flexor muscle resulting in bending a joint
fibromyalgia
widespread pain in the muscles, cause unknown, but stress, weather, and poor physical fitness affect the condition
muscular dystrophy
group of inherited diseases that lead to chronic, progressive, muscular atrophy
myasthenia gravis
chronic condition where nerve impulses are not properly transmitted to the muscles
muscle spasms
sudden, painful, involuntary muscle contractions
strain
overstretching of or injury to a muscle and/or tendon