D. It must go from areas of low concentration to high, and this is only achievable with the use of energy, ATP!
<span>This is an example of myotatic or stretch reflex. This is a muscle contraction that happens when there is stretching within a muscle. The myotatic reflex is a monosynaptic reflex, which provides automatic regulation of skeletal muscle length. A muscle spindle is stretched when a muscle lengthens. This increases nerve activity.</span>
It takes the food you eat, breaks it up into small pieces, and turns it into energy
Energy from the sun heat and chemicals
