**Question:**What is a difference in membrane potential in the auto-rhythmic vs contractile cardiomyocyte?**Options:**1. ○ auto: has a plateau; contractile has a pacemaker (rising resting membrane potential)2. ○ auto: Na flows initiates depolarization; contractile: K+ initiates depolarization3. ○ auto: unstable resting Vm; contractile: stable resting VmThis question explores the differences between membrane potentials in auto-rhythmic and contractile cardiomyocytes. Auto-rhythmic cells are responsible for generating and conducting electrical impulses in the heart, often characterized by an unstable resting membrane potential that is essential for pacemaking activity. In contrast, contractile cardiomyocytes are involved in the mechanical contraction of the heart muscle and typically have a stable resting membrane potential, preparing them to respond to stimulation with contraction.

Cardiac tissue consist of muscles which helps in the contraction of the heart. They have two different types of muscle fibres.In the cardiac auto rhythmic muscles there is no plateu phase , but have continue contraction cycle. They also don't have a resting membrane potential which is very stable. But in the the contractile muscles they have a very stable resting membrane potential. In contractile muscles depolarization is initiated by Sodium ions and not by potassium ions. Hence the correct choice is third statement

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Anatomy and Physiology

What is a difference in membrane potential in the auto-rhythmic vs contractile cardiomyocyte auto: has a plateau; contractile has a pacemaker (rising resting membrane potential) auto: Na flows initiates depolarization; contractile: K+ initiates depolarization auto: unstable resting Vm contractile: stable resting Vm O O

What is a difference in membrane potential in the auto-rhythmic vs contractile cardiomyocyte auto: has a plateau; contractile has a pacemaker (rising resting membrane potential) auto: Na flows initiates depolarization; contractile: K+ initiates depolarization auto: unstable resting Vm contractile: stable resting Vm O O

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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