structure of heart

2. SREENARAYANA TRAINING
COLLEGE
SREEKANDESWARAM

3. SUBMITTED TO
SOYA P
SUBMITTED BY
SARANYA .S.S
NATURAL SCIENCE
REG: NO: 13383015
SUBMITTED ON
20-09-2014

4. STRUCTURE
OF
HEART

5. INTRODUCTION
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.[

6. 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

7. 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

8. 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)

9. 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

10. Function of the Atrioventricular Valves
Figure 18.9a

11. 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

12. 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

13. THANKS