The structure of the human heart.

https://www.youtube.com/watch?v=JIjKZah2CBw

What are the four chambers of the heart

The top two are called the atria, they have relatively thin muscular walls

The bottom two chambers are called the ventricles, they have a much thicker, muscular wall than the atria.

How are the atria separates from the ventricles.

By the atrioventricular (AV) valves.

The left AV valve is called the bicuspid valve, right AV valve is called the tricuspid valve.

How are the left and right sides of the heart separated

By a wall called the septum, the septum prevents any blood from passing directly between the two sides of the heart.

Explain the two branches of vena cava

Deoxygenated blood enters the right atrium through the vena cava.

The superior vena cava brings in blood from the head and the upper parts of the body, whereas the inferior vena cava brings in blood from the lower parts of the body.

What happens to the deoxygenated blood after entering from vena cava

It is pumped from the right atrium to the right ventricle, the right ventricle now pumps the deoxygenated blood out of the heart to the lungs through the pulmonary artery.

What happens once oxygenated blood returns from the lungs.

Comes back from the lungs and back into the heart through the pulmonary vein,

The pulmonary vein brings blood into the left atrium, it then passes into the left ventricle, which pumps the blood out of a large blood vessel called the aorta.

What does the aorta do

Transfers oxygenated blood to all the parts of the body including the head.

Why does left ventricle have a thicker muscular wall than the right

The left ventricle pumps blood around the whole body , whereas the right ventricle only pumps blood to the lungs.

What is the coronary artery

It branches from the aorta.

It supplies the heart muscle with oxygen and nutrients.