Examlex
When released in large quantities, thyroxine, a thyroid gland hormone, causes a sustained increase in heart rate.
Optimist
A person inclined to anticipate the best possible outcome, maintaining a hopeful and positive outlook on life and future events.
Pessimist
An individual who tends to see the worst aspect of things or believe that the worst will happen.
Reactivity
The tendency of individuals to change their behavior in response to being observed or knowing they are being studied.
Hardiness
A personality trait characterized by a sense of control, commitment, and challenge in the face of stress, acting as a buffer against stress-related disorders.
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