Answered: В АВ CD Time At the moment pointed to…

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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First select box, Options are chloride/protons/potassium/calcium/sodium/

Second select box, Options are exiting/entering

Third slect box, Options are charge/concentration/charge and concentration

A
АВ CD
Time
At the moment pointed to by the arrow the ion
[ Select ]
is
[ Select ]
the pacemaker cell driven by [ Select ]
Membrane
potential (mv)

Expert Solution

Step 1

The heart is made up of cardiac muscle. It contains network of specialized cardiac muscle fibers called autorhythmic fibers because they are self-excitable. They generally generate action potentials that trigger heart contractions. Cardiac action potentials normally begin in the sinoatrial node (SA node), which act as the heart's pacemaker, initiating cardiac action potentials that causes contraction of the heart.

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