The rapid depolarization phase of heart pacemaker cells is caused by which of thefollowing?movement of Na+ through funny channelsmovement of Ca++ through L-type channelsmovement of Na+ and Ca++ through funny channelsmovement of K+ through funny channelsall of the above

Answered: The rapid depolarization phase of heart…

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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Question

The rapid depolarization phase of heart pacemaker cells is caused by which of the
following?
movement of Na+ through funny channels
movement of Ca++ through L-type channels
movement of Na+ and Ca++ through funny channels
movement of K+ through funny channels
all of the above

Expert Solution

Step 1

Introduction:

A cardiac action potential is a brief change in voltage across the cell membrane of a heart cell. This is driven by the movement of charged ions between the interior and exterior of the cell via proteins called ion channels.

Autorhythmic cell action potential: Autorhythmic cells, which are specialized heart muscle cells, create action potentials (electrical impulses) inside the heart. These cells are self-excitable, which means they can generate a nerve impulse without the assistance of other nerve cells.