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NRTC Muscular System

Ch. 9, shuffle before use...BH

3 Types of muscle smooth, cardiac, skeletal
What is a Muscle Fiber a single muscle cell
What is Endomysium it coats the muscle fiber, help give it support
What are Fascicles groups of muscle fibers
What is the Perimysium outer layer that wraps around Fascicles
What is Epimysium A tissue that wraps groups of Fascicles together
Sacrolemma like plasma membrane for muscle fibers
Sarcoplasm like the cytoplasm for muscle fibers
Sarcoplasmic Reticulum Where calcium is stored
Consists of thick Filaments (myosin) and thin Filaments (actin) Myofilaments
What is required for muscles to move? ATP (energy)
The connection between a motor nueron and a muscle fiber is called a nueromuscular junction
When an impulse reaches the end of a motor neuron, it causes the release of acetylcholine (ACh)
ACh is known as a neurotransmitter
Continuous state of partial muscle contraction is called Muscle tone
What causes muscle tone? posture, standing, holding your head up
What is a motor unit? A neuron and all the fibers it stimulates.
What factors affect muscle Contraction? Frequency of stimuli, strength of nerve signals, and type of contraction.
Isometric contraction muscle length does not change
isotonic contraction lifting and changing muscle length
prime mover The muscle that triggers a movement
end of muscle that attaches to more stable bone origin
end of muscle that attaches to more freely moving bone insertion
muscle that assist the prime movers synergists
balances the use of a muscle antagonists
Created by: anyconda