0
from answers.com
When a nerve impulse reaches an axon ending, voltage-gated calcium channels in the axonal membrane open and calcium, which is extremely low inside the cell, enters the nerve ending. The increase in calcium-ion concentration causes hundreds of synaptic vesicles to fuse with the cell membrane and expel acetylcholine into the synaptic cleft (exocytosis). The acetylcholine released at a neuromuscular junction binds reversibly to acetylcholine receptors in the muscle end-plate membrane, a postsynaptic membrane that is separated from the nerve ending by a very short distance. The receptor is a cation channel which opens when two acetylcholine molecules are bound, allowing a sodium current to enter the muscle cell and depolarize the membrane. The resulting impulse indirectly causes the muscle to contract.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
The chemical that transmits the signal across the neuromuscular junction is called?
Acetylcholine
What are the two excitatory neurotransmitters?
acetylcholine
Cholinesterase causes acetylcholine to do what?
Cholineesterase is enzyme that hydrolyses acetylcholine .
What Are Ach levels?
See Acetylcholine http://en.wikipedia.org/wiki/Acetylcholine
What is the neurotransmitter of alpha-motor neuron?
Alpha-Motor neurons release the neurotransmitter acetylcholine at a synapse called the neuromuscular junction. When the acetylcholine binds to acetylcholine receptors on the muscle fiber, an action potential is propagated along the muscle fiber in both directions.
What happens when acetylcholine receptors are blocked?
There are several compounds and drugs that may block acetylcholine receptors. They are collectively known as cholinergic antagonists.
What is an example of acetylcholine?
acetylcholine
Acetylcholine is an example of what neurotransmitter?
acetylcholine
What is the main neurotransmitter of the parasympathetic autonomic nervous system?
Parasympathetic system has acetylcholine as its chemical mediator.
The chemical that transmits the signal across the neuromuscular junction is called?
Acetylcholine
Use stumble in a sentence?
Use stumble in a sentence.
What neurotransmitter is found at the synapse between nerves and human skeletal muscle cells?
Acetylcholine is the neurotransmitter at the neuromuscular junction.
What are the two excitatory neurotransmitters?
acetylcholine
Cholinesterase causes acetylcholine to do what?
Cholineesterase is enzyme that hydrolyses acetylcholine .
What chemical stimulates muscle contraction?
acetylcholine (ACh)
What Are Ach levels?
See Acetylcholine http://en.wikipedia.org/wiki/Acetylcholine
What type of excitatory neurotransmitter is secreted by motor neurons innervating skeletal muscle?
Acetylcholine is the excitatory neurotransmitter released by neurons innervating skeletal muscles. Acetylcholine release stimulates muscle contraction by acting at the nicotinic-acetylcholine receptor on the surface of the muscle cell.
