In response to bright morning light:

Question

Quizplus · Accepted Answer

The suprachiasmatic nucleus (SCN) is responsible for regulating the body's circadian rhythm in response to the amount of light present in the environment. When there is bright morning light, the SCN signals the pineal gland to decrease production of melatonin, which is a hormone that promotes sleepiness. Therefore, choice B is the correct answer.

A) is incorrect because an increase in K complexes is associated with sleep rather than wakefulness. 
C) is incorrect because bright light typically suppresses, rather than stimulates, the production of melatonin. 
D) is incorrect because hypermnesia (a condition in which an individual experiences enhanced memory recall) is not a common response to bright morning light.

In Response to Bright Morning Light