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