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A muscle fiber will not respond to a stimulus until that stimulus reaches what?
A muscle fiber will not respond to a stimulus until that stimulus reaches the threshold level needed to trigger an action potential. This threshold level is the minimum amount of stimulus required to elicit a response from the muscle fiber.
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?
When a weak stimulus is applied to a muscle fiber, only a few motor units are recruited to contract. This results in a partial muscle contraction where not all muscle fibers are activated. Stronger stimuli recruit more motor units, leading to a full muscle contraction.
What are the 3 structural components of a neuromuscular response?
The three structural components of a neuromuscular response are the motor neuron, the neuromuscular junction, and the muscle fiber. The motor neuron transmits signals from the brain or spinal cord to the muscle, the neuromuscular junction is where the motor neuron and muscle fiber meet and communicate, and the muscle fiber is the contractile tissue that generates force in response to nerve signals.
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 is a twitch contraction?
A twitch contraction is a single, brief contraction of a muscle fiber in response to a stimulus. It is the smallest unit of muscle contraction and is not strong enough to produce movement of a limb.
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 two structures are closely associated at the neuromuscular junction?
The two structures closely associated at the neuromuscular junction are the motor neuron and the muscle fiber. The motor neuron releases the neurotransmitter acetylcholine, which binds to receptors on the muscle fiber, initiating muscle contraction.
What are all muscle cells called?
A single muscle cell is called a muscle fiber.
Each muscle fiber is also called a?
Each muscle fiber is also called a myofiber.
What is the Smaller fiber in a muscle fiber?
Myofibril
