The human heart contains four chambers - two upper atria and two lower ventricles. Deoxygenated blood enters the right atrium and is pumped to the right ventricle. It then goes to the lungs where it receives oxygen before returning to the left atrium. The left atrium pumps blood to the left ventricle, which is the strongest chamber and pumps oxygenated blood out to the aorta and around the body.

1. HUMAN HEART
Keerti Kushwaha​

2. AGENDA
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Introduction
Chambers of heart
How it works
Summary

3. INTRODUCTION
• The heart is a fist-sized organ that pumps blood
throughout your body. It's the primary organ of
your circulatory system. Your heart contains four
main sections (chambers) made of muscle and
powered by electrical impulses.
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4. HUMAN HEART HAVE FOUR CHAMBERS
:-
1.The left atrium
2.The right atrium
3.The left ventricle
4.The right ventricle

5. .
The heart is like a pump that helps move blood throughout our body.
Blood carries important things like oxygen and nutrients to our body's
cells and takes away waste products. The heart is divided into four parts:
two atria (the top chambers) and two ventricles (the bottom chambers).
How the heart works ? 5

6. .
1. BloodEnters the Heart: Deoxygenated (without oxygen) blood from our
body enters the right atrium. This blood has given its oxygen to our
body's cells and needs more.
2. Atrium Contracts: The right atrium squeezes, and a door-like valve
called the tricuspid valve opens. This allows blood to flow into the right
ventricle.
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5. Ventricle Contracts: The right ventricle squeezes and pushes the
deoxygenated blood through another valve called the pulmonary valve
and into the pulmonary artery. This artery takes the blood to the lungs.
4. Oxygen Is Added: In the lungs, the blood picks up fresh oxygen and
gets rid of carbon dioxide, which is like waste for our bodies. This makes
the blood turn red. It then returns to the heart.
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8. .
5. Blood Returns to the Heart: Oxygenated blood returns to the left
atrium. It's now full of oxygen and ready to go to the rest of the
body.
6. Atrium Contracts Again: The left atrium contracts, and a valve
called the bicuspid (or mitral) valve opens. This lets the
oxygenated blood flow into the left ventricle.
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7. Ventricle Contracts Again: The left ventricle is the strongest part
of the heart. When it squeezes, it sends the oxygen-rich blood
through the aortic valve and into the aorta, which is the main artery
of the body.
8. Blood Goes to the Body: From the aorta, the oxygenated blood
flows to all parts of our body, bringing oxygen and nutrients to our
cells.
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10. SUMMARY
1. Deoxygenated blood returns from the body to the right atrium.
2. The right atrium contracts, opening the tricuspid valve, allowing blood into the right ventricle.
3. The right ventricle contracts, sending deoxygenated blood to the lungs through the pulmonary valve and artery for
oxygenation.
4. Oxygenated blood returns to the left atrium from the lungs.
5. The left atrium contracts, opening the bicuspid valve, allowing blood into the left ventricle.
6. The left ventricle, the strongest chamber, contracts, pumping oxygenated blood into the aorta for distribution to the body.
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11. THANK YOU
Keerti Kushwaha
Kushwahakeerti82@gmail.co
m
Convent of Gagan Bharti ,
New Delhi
7th A1