Are there episodes about respiratory, excretory, digestive, and nerve systems? I realized that there are 8 animal systems included in ap exam... most likely.... so... I am just hoping to learn them 2.

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Hey,I suggest you go onto YouTube or GoogleVideo and look up these systems.P.S.-Try to find one from a college/university or other reputable source.Hope this helps.

Oops, hit submit early. To continue:the cerebellum helps with coordination and balance, the thalamus/hypothalamus do a lot of autonomic control esp. by controlling the pituitary gland's hormones, the cerebrum does sensory analysis and complex thought.  Know the basic functions of the lobes, and know the general structure of the eye and inner ear. At the cell level, neurons=nerve cells, receptors=sense detectors, glial cell=helper cells.  Dendrites are the part of a neuron that receives signals (like your ears), the axon sends signals out (like your mouth).  Signals can travel along a neuron's membrane as an Action Potential, a sequential in/out movement of Na+ & K+ (sort of like sending signals by doing the Wave in a stadium).  Myelin is a fat that can be used to speed this process up in saltatory conduction by making the signal jump from nodes along the membrane. An axon signals the next neuron by releasing neurotransmitter molecules that stick to receptor proteins.