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Guanylate cyclase {Ans: produces cGMP and is inhibited by calcium - in light, calcium decreases, so guanylate cyclase activity rises and cGMP production increases, and the channels open, letting calcium back in (adaptation)}neural plate/groove {Ans: At day 18, there is a patch of the ectoderm called the neuroectoderm, which develops into the neural plate, which at day 20 becomes the neural groove, which becomes the neural tube, which forms the nervous system}medial superior olive {Ans: monitors interneural time difference for low-frequency sounds - sounds coming directly from one side have the largest delay from ear to ear, sounds directly in front/behind of you have no delay}receptor adaptation {Ans: if you give a constant indentation, they do not give a constant rate of firing}flexion-crossed extension reflex {Ans: When you step on something sharp/painful, we immediately pull up that leg, but we also push down on the other leg to support your weight - flexes the leg in pain and extends the other leg.}shedding of discs {Ans: occurs through phagocytosis, where the discs are pinched off and taken into the retinal pigment epithelium}