Examlex
What was the source for the drug penicillin, and what type of drug is that?
Theories
Systematically organized sets of concepts and propositions intended to explain a phenomenon or body of facts.
Neurotransmitters
Chemical substances in the brain that transmit signals from one neuron to another, influencing mood, thought processes, and bodily functions.
Chemical Substances
Chemical substances are forms of matter with constant chemical compositions and properties, and include elements and compounds used in various areas of daily life and industries.
Neuron
A cell in the nervous system that transmits information through electrical and chemical signals.
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