Video 1: How Do Pain Relievers Work? (4:13)

Figure 1: Structure of A Neuron

Video 2: Neuron Resting Potential (3:57)

Video 3: Nerve Impulse (2:52)

Video 4: Synapse (Acetylcholine) (1:22)

Figure 2: Synapse

Video 5: Action Potentials and Muscle Contraction (1:21)