Circadian rhythms are passive responses to the light dark cycle and can not persist in the absence of time cues.

What does the AASM recommend as a start time for middle and high schools? What is their rationale for this recommendation? Do you agree with this, and why or why not?

Which of the following is an extracellular fluid?

In which of the following is testosterone produced in the testis?

Sympathetic neurons can serve as ________ stimuli for hormone release from certain endocrine organs.

Heart rate, blood pressure, and cardiac output decrease and reach their lowest levels during: 

During REM the ability to regulate body temperature is reduced compared to wakefulness.

Slow wave sleep parasomnias are most common in prepubertal  children.  This is most likely due to:

How does the stomach play a role in decreasing the number of microorganisms inside the body?

AIDS patients have a low number of which of the following cells?