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acetylcholine
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A muscle fiber will not respond to a stimulus until that stimulus reaches what?
it will not respond until it reaches the threshold level
What is the all none law of muscle response?
all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is not dependent on the strength of the stimulus. If the stimulus is any strength above threshold, the nerve or muscle fiber will give a complete response or otherwise no response at all
A weak stimulus can cause a muscle fiber to contract only partway?
yes
What fiber transmits impulses to the central nervous system?
The nerve fiber.
What is the enzyme found in the synaptic space between a neuron and a muscle fiber that breaks down the excitatory neurotransmitter chemical that originally caused the muscle fiber to contract called?
acetylcholinesterase
What stimulates intestinal muscle contractions?
Nicotien or anything chemical which stimulates the Nicotinic receptors.
What is a twitch?
a twitch is a single stimulus-contraction-relax action sequence in a muscle fiber. They can vary in duration depending on the type of muscle, it's location, internal and external enviromental conditions and other factors.
What are all muscle cells called?
A single muscle cell is called a muscle fiber.
The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called?
neuromuscular junctions
What is the Smaller fiber in a muscle fiber?
Myofibril
What is the function of the neuromuscular junction is to?
Includes the axon terminal of a motor neuron plus the motor end plate of a muscle fiber. Is where the axons of motor nerves meet the muscle & transmit messages from the brain which cause the muscle to contract & relax.
Exercise can do what?
make more muscle fiber
