DAANCE module 1: Basic Sciences

1)What is the role of the central nervous system? 2)What are the 3 subdivisions of the central nervous system? - correct answers--1) To provide overall control of body function 2) Central Nervous System, Peripheral Nervous System, Autonomic Nervous System NERVOUS SYSTEM: 1) What are the cells of the nervous system called? 2) What are they responsible for? 3) What is action potential? What happens during this? 4) How is this related to a synapse? 5) What is a synapse? - correct answers--1) Neurons 2) Responsible for conducting nerve impulses within the brain and from one body part to another 3) The nerves threshold of stimulus. When an impulse reaches the threshold, the impulse travels along the neuron at a constant rate. 4) When an impulse reaches the end of the neuron, it can pass to another neuron across a synapse. 5) A junction between two neurons. DEPOLARIZATION/REPOLARIZATION: 1) Explain depolarization. 2) What substance is often the material moving in and out of the membrane? 3) What is the wave of polarization? 4) Explain repolarization. 5) How does this relate to local anesthetics? - correct answers--1) The outside of a nerve membrane is positively charged. When those charges move into the membrane, the outside is left negatively charged. 2) Na+ ions 3) The movement of changing charges during depolarization. 4) After the nerve impulse passes through the nerve, the nerve fibers become repolarized, or positively charged, again. 5) Local anesthetics interfere with Na+ ions traveling through the ion channels, preventing depolarization and slowing or stopping the nerve impulses.