tailieunhanh - Lecture Human anatomy (6/e): Chapter 21 - Martini, Timmons, Tallitsch

Chapter 21 - The cardiovascular system - The heart. We begin this chapter by examining the structural features that enable the heart to perform so reliably, even in the face of widely varying physical demands. We will then consider the mechanisms that regulate cardiac activity to meet the body’s ever-changing needs. | I HUMAN ANATOMY SIXTH EDITION C h a p t e r 21 MARTINI TIMMONS FA I. LITSCH The Cardiovascular System The Heart PowerPoint Lecture Slides prepared by Jason LaPres North Harris College Houston Texas Copyright 2009 Pearson Education Inc. publishing as Pearson Benjamin Cummings Introduction The blood must stay in motion to maintain homeostasis. The heart keeps blood moving. The volume of blood pumped by the heart can vary widely between 5 and 30 liters per minute. Copyright 2009 Pearson Education Inc. publishing as Pearson Benjamin Cummings An Overview of the Cardiovascular System The heart is a small organ your heart is roughly the size of your clenched fist. Two closed circuits Pulmonary circuit carries carbon dioxide rich blood from the heart to the lungs and back Systemic circuit transports oxygen-rich blood from the heart to the rest of the body and back The heart has four muscular chambers Right and left atria collect blood returning to heart Right and left ventricles discharge blood into vessels to leave the heart Copyright 2009 Pearson Education Inc. publishing as Pearson Benjamin .

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