The first stage of sleep is called:

G-proteins bind:

If blood glucose levels are too low, this could be due to:

________ monitor body position.

___________ is a disease in which antibodies stimulate the thyroid.

Calcitonin is secreted by:

__________ are more light-sensitive (i.e., can be activated under lower-light conditions). 

In a visceral reflex arc, sensory information is carried to the spinal cord via the:

Adrenergic receptors are located on (or in)…

______________ can cause futile cycles (e.g., mitochondrial uncoupling) to occur within the cells of the body.