In young adulthood, the leading cause of death is

When pain impulses are transmitted from pain receptors, which of these is released by the axons?

a) dopamine b) substance P c) serotonin d) acetylcholine

What requirement does attention place on our sensory systems?

a) We must filter out some stimuli to process. b) We can pay attention to only one stimulus at a time. c) We must divide our attention to process all stimuli. d) We must shift our attention quickly between different stimuli.