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It varies:
In the somatic system (skeletal muscle) and parasympathetic branch of the autonomous nervous system (smooth & cardiac muscle) it is usually acetylcholine.
In the sympathetic branch of the autonomous nervous system (smooth & cardiac muscle) it is usually norepinephrine (also called noradrenaline).
There are exceptions, but this is the general rule.
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What carries an impulse across a synapse to a muscle?
neurons?
When the blank reaches the ends of the axon the neurotransmitter is released and diffuses to the muscle cell membrane?
Synaptic vesicle
What reaches the end of the axon when the neurotransmitter is released and diffuses to the muscle membrane to combine with receptors there?
nerve impulse
What happens to the neurotransmitter once it is released?
Once released, the neurotransmitter travels across the synaptic gap and binds to receptors on the membrane of the target cell. This binding induces a response in the target cell, such as an action potential or a change in cellular activity. The neurotransmitter is then either broken down by enzymes, taken back up into the presynaptic neuron for recycling, or diffuses away.
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 is the neurotransmitter of the 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.
Describe the interaction of acetylcholine and calcium ions in stimulating muscle contraction?
The acetylcholine diffuses across the synapse and binds to and activates nicotinic acetylcholine receptors on the motor end plate of the muscle cell. Activation of the nicotinic receptor opens its intrinsic sodium/potassium channel, causing sodium to rush in and potassium to trickle out.
What location does a neuron transfer an impulse to another cell?
A neuron transfers an impulse to another cell at a specialized junction called a synapse. At the synapse, the neuron releases neurotransmitters that carry the signal across the gap to the receiving cell, which can be another neuron, a muscle cell, or a gland cell.
How do nerves impulse's across the synapse?
Most neurons have a chemical synapse, which is to say that a substance called a neurotransmitter is released from the first neuron (called pre-synaptic) to the next neuron called (post-synaptic). How is the release triggered? When an action potential reaches the terminus (end of the axon) there are specialized calcium channels that are opened (voltage-gated). The calcium bind so the inner membrane and triggers the release of small membrane bound vesicles which spill out their contents of neurotransmitter into the synaptic cleft. The neurotransmitter binds to specific receptors on the post-synaptic membrane and that causes the action potential to propagate on (or for the neurotransmitter to cause an action like a muscle contraction).
What is a synapse in a simple reflex action?
A synapse in a simple reflex action is a junction between two neurons where signals are transmitted. In a reflex action, when a stimulus triggers a sensory neuron, it sends a signal across a synapse to a motor neuron, which then causes a rapid response from a muscle or gland.
What kinds of compounds in the body transmit impulses between nerve and muscle cells?
Neurotransmitters such as acetylcholine transmit impulses between nerve and muscle cells. These chemical messengers are released at the synapse where nerve and muscle cells meet, allowing for the transmission of signals that trigger muscle contraction.
What neurotransmitter is found at the synapse between nerves and human skeletal muscle cells?
Acetylcholine is the neurotransmitter at the neuromuscular junction.
