7:5 Muscular System assignment
What is a contracture?
A severe tightening of a flexor muscle resulting in bending of a joint
Moving the arm away from the side of the body
Abduction
Moving a body part toward the midline
Adduction
Moving the leg in toward the body
Adduction
4 functions of skeletal muscles
Attach to bones Produce heat and energy Protection of internal organs Maintain posture
Muscle of upper arm that flexes lower arm
Biceps brachii
3 main kinds of muscles and the main function of each kind.
Cardiac- forms walls of the heart and contracts to circulate blood Visceral- contracts to cause movements Skeletal- causes body movement
Swinging the arm around in a circle
Circumduction
Ability to become short and thick
Contractibility
Three muscles that can be used as injection sites
Deltoid, gluteus maximus, quadriceps femoris
Ability to return to its original shape
Elasticity
Ability to respond to a stimulus
Excitability
Abulity to be streched
Extensibility
Increasing the angle between two bones
Extension
Straightening the lower leg away from the upper leg
Extension
Name the joints affected most frequently by contractures.
Fingers, wrists, knees, and foot drop
Bending the lower arm up toward the upper arm
Flexion
Decreasing the angle between two bomes
Flexion
Muscles between ribs used for breathing
Intercostals
What's is muscle tone?
Partial contraction
Bending the foot away from the knee
Plantar flexion
Muscle on upper chest that adducts upper arm
Rectoralisis major
Muscle that compresses the abdomen
Rectus abdominis
Turning a body part on its own axis
Rotation
Turning the head from side to side
Rotation
Muscle on front of thigh that abducts and flexes leg
Sartorial
Muscle on front of thigh that extends leg
Sartorial
Muscle on side of neck that turns and flexes head
Sternocleidomastoid
Turning a body part upward
Supination
2 ways skeletal muscles attach to bones
Tendons and fascia
What occurs when muscles atrophy?
They shrink in size and lose strength
Muscle on front of lower leg that flexes and inverts the foot
Tibias anterior
Muscle on upper back and neck that d and moves shoulders
Trapezius
What is the difference between voluntary and involuntary muscles?
Voluntary means having control over movement and involuntary means function without concours thought
What causes muscles to atrophy?
When muscles are used for a long period
