Draw a line graph that illustrates the relationship between skin reflectance (high numbers = lighter skin color) and serum folate levels for a population living at a low latitude (or high UV index).

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explanation:

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after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.