Ch 10 Flashcards
Motor unit
Muscle fibers under control of a single motor axon
Tetanus
Sustained muscle contraction
Neuromuscular junction
Motor neuron transmits the effect of a nerve impulses to the muscle fiber here
Atrophy
Decrease in muscular activity or damage to neurons
Istonic contraction
Concentric contraction and eccentric contraction
Muscle length may change
Contractility
Resisting separation between two bones
Pulling two bones closer together
Elasticity
Stretch muscle returning to original length
Resisting desperation of two bones
Slow twitch fibers
Main purpose is for support
Many capillaries
Known as red fibers
Resting tension
Skeletal muscles do not completely relax at rest
Isometric contraction
Muscle tension
No movement of muscle
Ex. Pushing against wall
Isotonic contraction
Muscle tension results in movement of muscle
Ex. Lifting
Concentric
Shortening of muscle
Eccentric
Lengthening of muscle
Sphincters
Circular muscle bands contract and relax to regulate passage of materials in and out of stomach
Excitability
Excited my stimulus
Neurotransmitter from neuron
Conductivity
Allows response to travel throughout cell
Fascia
Separated individual muscles and binds together muscles with similar functions
Outermost layer
Myofibrils made of?
Made of myofilaments -proteins
What does the sarcoplasmic reticulum store?
Calcium
Myofilaments
Bundled within myofibrils
Sarcomeres
Overlapping thick and thin myofilaments
I-band
Shortens during contraction
A-band
Contains thick and some thin filament
Doesn’t change length during contraction
Thin filaments
Actin
Troponin
Tropomyosin
