Examlex
Gravity was important in the formation of our planet because it pulled dense metals such as iron and nickel inward, forming Earth's core.
Neurotransmitter
Chemical substances in the nervous system that transmit signals across a synapse from one neuron to another.
Antagonist
A substance that blocks or inhibits the effects of a neurotransmitter or hormone.
Opiate
A group of drugs derived from opium, used for pain relief, but also associated with addiction and dependence.
Excitatory Messages
Neurological signals that increase the likelihood of a neuron firing and thus stimulate action in the nervous system.
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