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Electrical excitation of a muscle fiber. Skeletal
muscle fibers (cells) can be stimulated either by amotor neuron in the body or by a voltage stimulator
in the lab. Stimulation given by either method results
in a depolarization of the sarcolemma. If the
depolarization reaches threshold, an action potential
(electrical signal) is initiated.
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∙ 13y ago
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Excitation-contraction coupling refers especially to the means by which do what?
means by which electrical excitation of a muscle results in muscle contraction
What best describes the events of excitation in excitation-contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
What substance couples electrical excitation to muscle contraction?
Ca2+
What describes the events of contraction in excitation-contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
What is the process of excitation contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
What is the sequence of electrical changes that occurs along the sacrolemma when a muscle fiber is stimulated?
action potential
What Chemical enters a muscle cell upon excitation?
Acetylcholine is the chemical that crosses the synapse causing a muscle to contract. It is released due to an electrical impulse sent from your brain down your nervous system.
Describe the 'all or nothing' principle of muscle fiber recruitment?
HORRIBLY CONDENSED. An electrical event of sufficient strength from the end of a nerve to pass into a muscle fiber(s) (end plate) resulting fiber(s) tension. The more electrical events 'spikes" per second (rate coding) to a point the greater, to a point, the tension(s).
What are all muscle cells called?
A single muscle cell is called a muscle fiber.
ECGs trace electrical excitation to different parts of the heart?
yes
What are the 4 stages of a muscle cell?
Tonus (relaxation), Excitation (neural stimulation, Clonus (contraction), Tetanus (prolonged contraction), return to Tonus (relaxation) Or Excitation, Excitation-Contraction Coupling, Contraction, Relaxation
What is the Smaller fiber in a muscle fiber?
Myofibril
