Muscular system unit 3

Myofibrils

A muscle fiber is made of thread like structures called....

Skeletal muscle

A muscle responsible for moving parts of the body such as limbs, trunk, and face

Voluntary muscle

A muscle that can consciously control itself

Cardiac muscle

A muscle that makes up the walls of the heart

Extensor

A muscle that straightens a joint-tricep

Smooth

Forms muscle layers on the walls of stomach, intestines, etc.

Smooth muscle

Forms the muscle layers found in the walls of the stomach, intestines, blood vessels, and other internal organs

Muscle fiber/muscle cell

Makes up skeletal muscle tissue and is made out of elongated cells

Cardiac

Makes up walls of the heart

Skeletal

Moves body parts like limbs

Flexors

Muscles that causes a joint to bend-bicep

How does a muscle contract?

Myosin and Actin filaments slide over each other to shorten length of sarcomere

Intersection

The point where the muscle attaches to the moving bone

Origin

The point where the muscle attaches to the stationary bone- where it ORIGINALLY comes from

Sarcomere

The region from one z line to another, consists of myofibrals, uses ATP, and is the functional unit of muscle contraction- when skeletal muscle contracts this shortens

Myosin

Thick filaments made of protein

Actin

Thin filaments made of protein

Achilles' tendon

attaches the gastrocnemius muscle to the heel bone

Fascicle

bundle of muscle fibers

Involuntary muscle

muscle that cannot be consciously controlled

Oxygen debt

temporary lack of oxygen in the muscle due to exertion

Muscle fatigue

the physiological inability of a muscle to contract