3. Electrical Signal: The Action Potential In the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. +30 Discuss the importance of threshold. How does this relate to the concept of APs being all or none? -55 – - Threshold -70 3 4 Time (msec) Membrane potential (mV)

3. Electrical Signal: The Action Potential In the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. +30 Discuss the importance of threshold. How does this relate to the concept of APs being all or none? -55 – - Threshold -70 3 4 Time (msec) Membrane potential (mV)

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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