Chapter 11.4, Problem 4CC

Summary Introduction

To know: The reason for the difference in the action of cardiac muscles and respiratory muscles towards epinephrine.

Introduction: The heart is largely made up of a type of muscle tissue called cardiac muscle. This muscle contracts when the heart beats, allowing blood to pump through the body. Cardiac muscle cells are located in the walls of the heart. Smooth muscle fibers are found in the walls of hollow visceral organs (such as the liver, pancreas, and intestines), except for the heart, and are spindle-shaped.