Ch. 7.5 Muscular System Key Terms
the ability to respond to a stimulus such as a nerve impulse
What is excitability?
muscle fibers that are stimulated by nerves contract, or become short and thick, which causes movement
What is contractibility?
to have control over an action
What is voluntary?
to function without conscious control
What is involuntary?
bending forward or bending the foot away from the knee
What is plantar flexion?
moving a body part away from the midline
What is an abduction?
bending backward or bending the foot toward the knee
What is dorsiflexion?
increasing the angle between two bones, or straightening a body part
What is extension?
an organ system made of organs called muscles
What is the muscular system?
turning a body part around its own axis
What is rotation?
forms the walls of the heart and continues to circulate blood
What is cardiac muscle?
a severe tightening of a flexor muscle resulting in bending of a joint
What is contracture?
a tough, sheetlike membrane that covers and protects the tissue
What is fascia?
a state of partial contraction
What is muscle tone?
turning a body part upward
What is supination?
moving in a circle at a joint, or moving one end of a body part in a circle while the other end remains stationary
What is circumduction?
allows the muscle to return to its original shape after it has contracted or stretched
What is elasticity?
the end that moves when a muscle attaches to a bone
What is insertion?
the end that does not move when a muscle attaches to a bone
What is the origin?
attached to bones and causes body movement
What is Skeletal muscle?
moving a body part towards the midline
What is adduction?
ability to be stretched
What is extensibility?
decreasing the angle between two bones or bending a body part
What is flexion?
turning a body part downward
What is pronation?
found in the internal organs like the digestive and respiratory systems, as well as blood vessels
What is visceral muscle?