This presentation is about circulatory system

1. CIRCULATORY SYSTEM-
HEART
By Mosuhli Ntebaleng

2. NAME: Mosuhli Ntebaleng 2021/2273
E-mail: mosuhli97@gmail.com
I am a third year student at Lesotho College of Education Thaba-Tseka Campus.
My presentation is about the circulatory system-heart structure and its functions.

3. Definition of circulatory system
Circulatory system is a system of organ that include the heart, blood,
vessels and blood which is circulated throughout the entire body of a
human. So I am going to talk about heart structure and its function.

4. Heart has four chambers. Blood pumped
between the following four chambers:
Chambers of the heart
Right atrium Deoxygenated(low in O2)blood from the body enters the right atrium.
This blood is under low pressure.
Right
ventricle
Blood passes into the right ventricle ,which contract to pump blood to
the lungs, where the blood is oxygenated.
Left atrium Oxygenated blood(high in O2)from the lungs enters the left atrium.
This blood is still under low pressure.
Left ventricle Oxygenated blood enters the large left ventricle, which contract very
hard to push blood into the aorta(artery). The left ventricle is very thick,
and generates a high pressure to pump blood around the whole body.

5. Features and the adaptation of
chambers
 Ventricle have thicker walls than the atria- they pump blood at a higher
pressure than the atria whereas the pump to adjacent ventricle.
 The left ventricle has a thicker wall than the right ventricle- the left ventricle
pump the blood at a higher pressure as the body will be sent to the entire
body whereas the right ventricle only has to send the blood to the lungs
which is a much shorter distance so less pressure is needed.

6. How does the heart regulates the flow of
blood in the circulatory system
The heart regulates the flow of blood in the circulatory system through the
contraction and relaxation of its chambers. The coordinated contraction of the
atria and ventricles creates the pressure needed to pump blood through the
circulatory system.

7. STRUCTURE OF THE HEART

8. Major blood vessels of the circulatory
system include;
 Aorta
 Vena Cava
 Pulmonary artery
 Pulmonary Vein

9. BLOOD VESSELS OF THE HEART
Blood From To Information
Pulmonary
artery
Deoxygen
ated
Right
Atrium
Lungs Carry deoxygenated blood to the
lungs
Pulmonary
vein
Oxygenate
d
Lungs Left
Atrium
Blood carried back to the heart
Aorta Oxygenate
d
Left
Ventricle
Whole
body
Carries oxygenated blood at very
high pressure. It splits up into many
smaller arteries
Coronary
artery
Oxygenate
d
Supplies
the heart
Supplies
the heart
Supply the cardiac muscle with
oxygen
Vena Cava Deoxygen
ated
Whole
Body
Right
Atrium
Carries deoxygenated blood back to
the heart at very low pressure. It
receive blood from many smaller
veins

10. Function of right atrium and ventricle
The right atrium receives deoxygenated blood from the body and pumps it
into the right ventricle. The right ventricle then pumps the blood to the lungs
where it is oxygenated.

11. Function of the left atrium and
ventricle
The left atrium receives oxygenated blood from the lungs and pumps it into
the left ventricle. The left ventricle then pumps the blood out to the rest of the
body.

12. Function of the aorta
The aorta is the large artery in the body and is responsible for carrying
oxygenated blood from the left ventricle to the rest of the body.

13. Function of Vena Cava
The Vena Cava is a large vein that carries deoxygenated blood from the body
back to the heart specifically the right atrium.

14. Conclusion
Heart plays a crucial role in the circulatory system, pumping oxygenated
blood to the body and deoxygenated blood to the lungs for oxygenation. It is
well-structured chambers and valves ensure smooth blood flow and efficient
circulation throughout the body, enabling the delivery of essential nutrients
and removal of waste products.

15. Reference
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source