WELCOME

SREENARAYANA TRAINING COLLEGE

SREEKANDESWARAM

SUBMITTED TOSOYA P

SUBMITTED BY SARANYA .S.S

NATURAL SCIENCE REG: NO: 13383015

SUBMITTED ON20-09-2014

STRUCTURE OF

HEART

THE HEART IS A VITAL MUSCULARORGAN IN HUMANS AND MANY OTHER ANIMALS, WHICH FUNCTIONS TO PUMPBLOOD AROUND THE BODY THROUGH THE BLOOD VESSELS OF THECIRCULATORY SYSTEM.[

INTRODUCTION

The Heart

• Heart – typically weighs 250–350 grams (healthy heart)

• A muscular double pump• Pulmonary circuit – takes

blood to and from the lungs• Systemic circuit – vessels

transport blood to and from body tissues

Structure of the Heart• Right and left atria - Superior chambers, receive blood from the

pulmonary and systemic circuits• Right and left ventricles - Inferior chambers, the pumping chambers of

the heart• External markings

• Left/right auricles• Apex

• Internal Structures• Interventricular septa• Fossa ovalis

Chambers• Left atrium

• Makes up heart’s posterior surface

• Receives oxygen-rich blood from lungs

• Opens into the left ventricle through the Mitral valve (left atrioventricular valve)

• Left Ventricle• Forms apex of the heart• Internal walls of left

ventricle• Trabeculae carneae • Papillary muscles• Chordae tendineae

• Pumps blood through systemic circuit via the Aortic semilunar valve (aortic valve)

Heart Valves – Valve Structure

• Each valve composed of - endocardium with connective tissue core

• Atrioventricular (AV) valves between atria and ventricles

• Aortic and pulmonary valves at junction of ventricles and great arteries

Function of the Atrioventricular Valves

Figure 18.9a

Structure of the Heart – Coverings• Pericardium – two primary layers

• Fibrous pericardium - strong layer of dense connective tissue• Serous pericardium -formed from two layers

• Parietal pericardium• Visceral pericardium• Pericardial cavity

Blood Flow Through the Heart

Figure 18.6

• Beginning with oxygen-poor blood in the superior and inferior venae cavae• Go through pulmonary and systemic

circuits• A blood drop passes through all

structures sequentially

THANKS