Short answer: Neurotransmitters
Long answer: amino acids, monoamines, peptides
False
The synaptic knob contains vesicles filled with neurotransmitters. Therefore, Acetylcholine is the neurotransmitter that stimulates skeletal muscle to contract. It is released into the synaptic clefts between motor neuron axons and motor end plates.
Somatic type of nerves stimulate the muscle cells to contract.
synaptic cleft, where neurotransmitters are released by the synaptic terminal and bind to receptors on the muscle fiber to trigger a muscle contraction.
A, acetylcholine. Acetylcholine is commonly secreted at neuromuscular junctions, the gaps between motor neurons and muscle cells, where it stimulates muscules to contract. At other kinds of junctions, it typically produces and inhibitory post-synaptic potential.
acetylcholinesterase
The event that stimulates the contraction of cardiac muscle is the electrical signal generated by the sinoatrial (SA) node in the heart, also known as the pacemaker of the heart. This signal causes the heart muscle cells to contract and pump blood throughout the body.
The central nervous system.
Neuromuscular junction or neuromuscular synapse
synaptic cleft
The space between a nerve and muscle is called the neuromuscular junction. This is where the nerve endings release chemical messengers called neurotransmitters, which signal the muscle to contract.
When an action potential reaches the end of a motor neuron, it triggers the release of neurotransmitters (acetylcholine) into the synaptic cleft. These neurotransmitters bind to receptors on the muscle cell membrane, causing depolarization of the muscle cell and ultimately leading to muscle contraction.