Examlex
Which of the following processes did NOT contribute gas to Earth's secondary atmosphere?
Acetylcholine
A neurotransmitter involved in many functions including muscle movement, heart rate, memory, and the sleep-wake cycle.
Nicotine
A stimulating and addictive substance found in tobacco products.
Agonist
A chemical or drug that binds to receptors in the brain and causes a reaction similar to that of a naturally occurring neurotransmitter.
Excitatory Signal
A type of neurotransmitter-induced signal in the nervous system that increases the likelihood of a neuron firing an action potential.
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