Norepinepherine is produced when a person is calm

Which of the following statements is true?

a. Receptor cells react to any stimulus, regardless of the intensity. b. The first step in the sequence of events that produces a sensation is the change of energy into electrochemical impulses. c. All receptors have the ability to change the energy they receive into an electrochemical impulse. d. The nervous system uses different types of energy to code different sensory experiences.

Eysenck's basic personality dimension that describes whether people are characterized by tenderness, warmth, and helpfulness, or insensitivity and uncooperativeness is ______

a. introversion-extraversion c. neuroticism b. emotional stability-instability d. psychoticism