A Happy Meal is a kid's meal that comes with a toy related to a current movie, TV show or other piece of pop culture. The most collectible Happy Meal toys are the ones from the Sonic the HedgeHog series, the Super Mario Brothers series, the He-Man series, the Marvel Comics series and the Shrek series. These toys can be highly valuable based on their condition and age.There have been many other collectible toys as well.
Additionally, neurotransmitters chemically link the brain and spinal cord with the rest of your body: muscles, organs, and glands. Thus, our brain is not only an array of wires (nerve cells/neurons) but also a highly evolved chemical soup (neurotransmitters). Neurotransmitters affect every cell, tissue, and system in your body.
Typically, neurotransmitter receptors are located on the postsynaptic neuron, while neurotransmitter autoreceptors are located on the presynaptic neuron, as is the case for monoamine neurotransmitters; in some cases, a neurotransmitter utilizes retrograde neurotransmission, a type of feedback signaling in neurons where the neurotransmitter is released postsynaptically and binds to target receptors located on the presynaptic neuron.