7._Nervous_system

7._Nervous_system - Peer Pods: Nervous System 1....

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Peer Pods: Nervous System 1. ORGANIZATION OF NERVOUS SYSTEM (5 MIN.) The nervous system helps the body communicate with its surroundings by doing three things: 1) receiving sensory input, 2) integrating input, and 3) sending a response signal to another cell . These three functions occur both at the level of an individual neuron and the entire nervous system. Using the picture your TA gives you, work as a group to address the following: A. Identify which part of an individual neuron performs each of the functions listed above. B. Identify what parts of the nervous system are responsible for these functions. C. What type of neuron is responsible for each of these three functions? TA Key: A. Neuron: Dendrites receive sensory input. Cell body integrates input (summation of graded potentials). If summation results in sufficient depolarization to reach threshold, an action potential is generated “where the axon arises from the cell body.” (AKA axon hillock) B. Nervous System: The sensory pathways of the peripheral nervous system (PNS) receive stimuli from both inside and outside of the body and carry it to the central nervous system (CNS). Afferent or ascending neurons are responsible for conveying sensory information. The CNS (brain and spinal cord) integrate the input. Motor pathways (efferent or descending neurons) send a response to either voluntary (somatic) effectors or involuntary (autonomic) effectors. C. Types of Neurons: Sensory neurons receive stimuli, interneurons integrate, motor neurons carry the response to the effector.
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2. NO REST FOR THE WEARY – DESCRIBING RESTING POTENTIAL (10 MIN) Your TA will split your pod in half and will give each half an envelope. In the envelope you will find a description of the NA/K pump in either pictures or words. 1. Work with your group to put the steps in the correct order. 2. Work with the other group to combine the pictures with the correct label. 3. Work as a group to address the following questions: A. How does the Na/K pump contribute to resting membrane potential? B. What is resting membrane potential (measured value)? C. How do leakage channels contribute to resting potential? D. Ouabain, otherwise known as arrow poison, acts like a straight-jacket on the Na/K pump, forcing it to remain in a fixed position. What would the effect of this drug be on resting potential? TA Key:
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This note was uploaded on 04/29/2008 for the course BIO 102 taught by Professor Various during the Spring '08 term at St. Lawrence.

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7._Nervous_system - Peer Pods: Nervous System 1....

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