Page 54 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

DRAWING DIAGRAMS - PARTS - PROCEDURE

HEART External features of HEART

1. Heart is situated towards the left side of chest cavity in
between two lungs.
2. It is made up of cardiac muscle.
3. It is the size of the fist of the person.
4. It is a hollow organ.
5. It is conical shaped organ.
6. Two deep grooves are visible on the outside of the heart. One verticle and
one horizontal.
7. These grooves indicate that the heart is internally divided into four cham-
bers, that is two auricles and two ventricles.
8. It is surrounded by a double layered, thin sac called Pericardium. It protects
the heart from physical shocks.
9. Coronary artery supplies O and glucose to the wall of heart Coronary vein
2
receives CO and waste materials.
2
INTERNAL STRUTURE OF HEART Internal Structure of HEART
1. Heart has four chambers. i.e.,Two upper - Auricles.
Two lower - Ventricles. How to draw
2. Right and left auricles are seperated by inter auricular septum. pl. scan QR
3. Right and left ventricles are seperated by inter ventricular spetum.
4. The walls of ventricles are thicker than the walls of auricles.
5. Right auricle is larger than left auricle.
6. Left ventricle is larger than right ventricle.
7. Right auricle opens into right ventricle through right auriculo ventricular aperture.
8. Left auricle opens into left ventricle through left auriculo-ventricular aperture.
9. Superior and Inferior venacavas are open into the right auricle.
10. Two pulmonary veins are open into the left auricle.
11. Pulmonary artery originates in the right ventricle.
12. Systemic aorta originates in the left ventricle.
13. Tri cuspid valve is located at Right auriculo ventricular pore.
RAJU’S NATURAL SCIENCE ACADEMY 14. Bi-cuspid valve is located at left auriculo ventricular pore.(Mitral valve)
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