Ch. 7.5 Muscular System Key terms
What is abduction
Moving a body part away from the midline.
What is Contracture
A severe tightening of a flexor muscle resulting in bending of a joint.
What is Extension
Increasing the angle between two bones, or straightening a body part.
What is Muscle tone
Muscles that are partially contracted.
What is Rotation
Turning a body part around its own axis; for example, turning the head from side to side.
What is Adduction
Moving a body part toward the midline.
What is Dorsiflexion
Bending backward or bending the foot toward the knee.
What is Fascia
A tough, sheetlike membrane that covers and protects the tissue.
What is Muscular system
More than 600 muscles
What is Skeletal muscle
Attached to bones and causes body movement. A person has control over its action.
What is Cardiac muscle
Forms the walls of the heart and contracts to circulate blood.
What is Elasticity
Allows the muscle to return to its original shape after it has contracted or stretched.
What is Flexion
Decreasing the angle between two bones, or bending a body part.
What is Origin
The end that doesn’t move when a muscle is attached to a bone.
What is Supination
Turning a body part upward.
What is Circumduction
Moving in a circle at a joint, or moving one end of a body part in a circle while the other remains stationary, such as swinging an arm in a circle.
What is Excitability
Irritability, the ability to respond to a stimulus such as a nerve impulse.
What is Insertion
End that moves when the muscle contracts.
What is Plantar flexion
Bending forward or bending the foot away from the knee.
What is Tendons
Strong, tough, fibrous connective tissue cords.
What is Contractibility
Muscle fibers that are stimulated by nerves contract or become short and thick which causes movement.
What is Extensibility
Ability of muscle tissue to be stretched or lengthened beyond its resting length without being damaged.
What is Involuntary
They function without conscious thought or control.
What is Pronation
Turning a body part downward.
What is Visceral muscle
Found in the internal organs of the body they contract to cause movement in these organs.