1
physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival.
2
released at the end of a nerve fiber by the arrival of a nerve impulse
3
when the membrane potential of a specific axon location rapidly rises and falls.
4
Affects attention and responding actions in the brain, and involved in the fight or flight response. Contracts blood vessels, increasing blood flow.
5
Involved in thoughts, learning, and memory. Activates muscle action in the body. Also associated with attention and awakening.
6
any of various types of cell that actively responds to a stimulus and effects some change
7
Produced on stressful or exciting situations. Increases heart rate and blood flow, leading to a physical boost and heightened awareness.
8
Released during exercise, excitement, and sex, producing well-being and euphoria, reducing pain. Biologically active section shown.
9
Most common brain neurotransmitter. Involved in learning and memory, regulates development and creation of nerve contacts.
10
Contributes to well-being and happiness; helps sleep cycle and digestive system regulation. Affected by exercise and light exposure.
11
Feelings of pleasure, and also addiction, movement, and motivation. People repeat behaviors that lead to it release.
12
a specialized cell transmitting nerve impulses; a nerve cell.
13
Calms firing nerves in CNS. High levels improve focus; low levels cause anxiety. Also contributes to motor control and vision.
