In this slide you will get information about the structure and mechanism of heart ................ :) :) Hope it will help you....... :)

1. KENDIRYA VIDYALAYA SARNI
SCIENCE PROJECT WORK
FUNCTION AND MECHANISM OF
HEART
SUBMITTED TO:- SUBMITTED BY:-
MRS. GUNNY MAM SHASHANK BANDRE
KHELESH BHALEKAR
10th ‘A’

2. STRUCTURE OF HEART
Septum

3.  The heart is roughly triangular in shape.
 It is made up of a special muscle called as cardiac
muscles.
 The size of our heart is as big as our fist.
 The heart has four compartments called ‘chambers’.
 The upper two chambers called atria, and the two
lower chambers are called ventricles.
 The heart has four valves
1) Tricuspid valve
2) Mitral valve
3) Pulmonary valve
4) Aortic valve

4.  The heart is divided into left and right side by a
septum.
 The right side of our heart pumps blood from
heart to lungs and the left side of our heart pumps
blood to all parts of the body.

5. HOW HEART WORKS?
 Blood from our body that is low in oxygen returns
to the superior and inferior vena cava, to fill hearts
right atrium.
 When the right atrium is filled with blood, the
tricuspid valve opens and blood is pumped into the
right ventricle. This is called as arterial sisterly.
 When the right ventricle is filled with blood the
tricuspid valve closes to prevent blood from flowing
back into the right atrium.
 Full with blood, heart right ventricle contracts the
pulmonary valve and blood is pumped into
pulmonary artery and onto our lungs.

6.  The pulmonary valve quickly closes to prevent
blood from flowing back into the right ventricle.
 Oxygen rich blood return from the lungs
through the pulmonary veins and fill the left
atrium.
 Left atrium contracts, the mitral valve opens
and the blood is pumped into the left ventricle.
This occurs at the same time when a new
contraction is taking place in hearts right atrium.
 When left ventricle is filled with blood, the
mitral valve closes to prevent the blood from
flowing back into the left atrium.

7.  Left ventricle contracts and aortic valve opens
and the blood is transported to all parts of the
body and the aortic valve quickly closes to
prevent blood from flowing back into the left
ventricle. This occurs at the same time when a
new contraction is taking place in the right
ventricle.