![]() The outer layer (adrenal cortex) secretes the stress hormone cortisol. Adrenal GlandĪn endocrine organ that secretes hormones. AdenosineĪ neurochemical that inhibits wakefulness, serving the purpose of slowing down cellular activity and diminishing arousal. Loss of control over drug intake or compulsive seeking and taking of drugs, despite adverse consequences. ![]() ![]() This occurs when a neuron is activated and temporarily reverses the electrical state of its interior membrane from negative to positive. Action PotentialĪn electrical charge that travels along the axon to the neuron's terminal, where it triggers the release of a neurotransmitter. A critical neurotransmitter that controls functions such as memory, attention, sleep, heart rate, and muscular activity.
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