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Chapter 41: Nervous System Supplemental Instruction Iowa State University Leader: Course: Instructor: Date: Adam Biology 211 Emeka Kemdirim 1. Nervous System is the response to changes in internal and external environments. What are the two categories the nervous system is broken into? Explain what each consists of. 2. Draw a picture of a Neuron and label relevant parts. 3. Name and describe the three classes of neurons. i. ii. iii. Supplemental Instruction 1060 Hixson-Lied Student Success Center 294-6624 www.si.iastate.edu 4. Membrane potential a. A cell’s resting potential is determined by differences between intracellular and extracellular ion concentrations. b. Draw an axon during resting c. Draw an axon during an action potential 5. Action potential sequence i. _________ potential- voltage gated ion channels shut ii. Graded potential- iii. iv. Hyperpolarization- v. Returns to resting potential What will happen if Na+ ions are allowed to flow across the membrane? What will happen if K+ ions are allowed to flow across the membrane?