Jawahar Navodaya Vidyalaya
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Jawahar Navodaya Vidyalaya. Borai - Durg (C.G.). Welcomes You. A. Presentation. On. Structure & Function. of. Human Heart. D E V E L O P E D B Y. D R. U. P. P A N I. P G T B I O L O G Y J N V B O R A I , D U R G ( C. G. ). Arch of Aorta. Superior Venacava.

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Jawahar Navodaya Vidyalaya

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Jawahar navodaya vidyalaya

Jawahar Navodaya Vidyalaya

Borai - Durg (C.G.)

Welcomes You


Jawahar navodaya vidyalaya

A

Presentation

On

Structure & Function

of

Human Heart


Jawahar navodaya vidyalaya

D E V E L O P E D B Y

D R. U. P. P A N I

P G T B I O L O G Y

J N V B O R A I , D U R G ( C. G. )


Jawahar navodaya vidyalaya

Arch of Aorta

Superior Venacava

Right Pulmonary artery

Left Pulmonary artery

Right Atrium

Left Atrium

Right Coronary Aetery

Pulmonary Trunk

Left Ventricle

Coronary sulcus

Anterior Interventricular sulcus

Right Ventricle

Inferior Venacava


Jawahar navodaya vidyalaya

HUMAN HEART

ORIGIN – MESODERMAL ORIGIN

POSITION-BEHIND THE STERNUM & BETWEEN THE

LUNGS IN THE THORASIC

SHAPE- LOOKS LIKE A BLUNT CONE

ENCLOSED IN PERICARDIUM, PERICARDIAL FLUID FILLED IN PERICARDIAL CAVITY.


Jawahar navodaya vidyalaya

STRUCTURE OF HUMAN HEART

HUMAN HEART CONSISTS OF FOUR CHAMBERS:

TWO UPPER THIN LAYERED ATRIA

TWO LOWER THICK LAYERED VENTRICLES

HEART BEARS 3 GROOVES OR SULCI –

CORONARY SULCUS (BETWEEN ATRIA &VENTRICLES)

ANTERIOR INTERVENTRICULAR SULCUS

POSTERIOR INTERVENTRICULAR SULCUS


Jawahar navodaya vidyalaya

RIGHT & LEFT ATRIA SEPARATED BY INTER ATRIAL SEPTUM

TWO VENTRICLES ARE SEPARATED BY INTERVENTRICULAR SEPTUM

ATRIA OPENS INTO THEIR RESPECTIVE VENTRICLES THROUGH AURICULOVENTRICULAR APERTURE GUARDED BY TRICUSPID VALVE & BICUSPID VALVE.

RIGHT AURICLE RECEIVES DEOXYGENATED BLOOD BY SUPERIOR VENA CAVA,INFERIOR VENA CAVA & CORONARY SINUS FROM WALL OF HEART

LEFT ARICLE RECEIVES OXYGENATED BLOOD FROM LUNGS FOUR PULMONARY VEINS.


Jawahar navodaya vidyalaya

ORIGIN AND CONDUCTION OF HEART BEAT

1. SA-NODE (SINO-ATRIAL NODE)-CALLED PACEMAKER AS IT IS FIRST TO ORIGINATE THE CARDIAC IMPULSES & DETERMINES THE RATE OF HEART BEAT.

CARDIAC IMPULSES CONDUCTED ALONG THE TRACT OF SPECIAL CARDIAC MUSCLE FIBRES OVER BOTH THE AURICLES.

2. AV-NODE(ATRIO-VENTRICULAR NODE)- IT IS STIMULATED BY THE WAVES OF CONTRACTION INITIATED BY SA-NODE. IT GENERATES CARDIAC IMPULSES, WHICH ARE CONDUCTED TO THE MUSCLES OF VENTRICLES THROUGH BUNDLE OF HIS & PURKINJE FIBRES.

3. BUNDLE OF HIS

4. PURKINJE FIBRES


Jawahar navodaya vidyalaya

CARDIAC CYCLE

CARDIAC CYCLE INVOLVES , THE PHASE OF CONTRACTION CALLED SYSTOLE & THE PHASE OF RELAXATION CALLED DIASTOLE.

A COMPLETE HEART BEAT CONSISTS OF A SYSTOLE & DIASTOLE OF BOTH ATRIA AND THAT OF BOTH THE VENTRICLES.


Jawahar navodaya vidyalaya

THE CARDIAC CYCLE INVOLVES FOLLOWING STEPS :-

1. ATRIAL SYSTOLE – CONTRACTION OF ATRIA

2. VENTRICULAR FILLING

3. VENTRICULAR SYSTOLE – FIRST HEART SOUND ‘LUBB’ PRODUCED WITH LONGER DURATION (0.16 – 0.90 SEC.).

4. VENTRICULAR DIASTOLE – SECOND HEART SOUND

‘DUBB’WITH SHORTER DURATION (0.10 SEC.)


Jawahar navodaya vidyalaya

With Thanks


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