Done By

B.G.S.Sneha

1. The heart is an organ which beats continuously to as a pump for the transport of blood , which carries other substances with it.

2. The human heart is an organ that pumps blood throughout the body via the circulatory system.

The heart is roughly the size of our fist.

It is about 250 to 300 grams (9 to 12 ounces).

The heart is divided into 4 chambers namely left atrium, right

atrium, left ventricle

and right ventricle.

HEART

The main function of heart is to pump oxygenated blood throughout the body. By doing this it keeps the organs functioning properly.

Your heart functions by contracting and relaxing to pump blood to other parts of your body and it cannot do this without your electrical system.

Your heart functions by sending blood through the four chambers with the help of the valves that sends oxygen and nutrients to all other parts of the body.

The functions of the heart are to receive blood from the body. Blood from the lungs is drawn in to the left side of the heart and then pumped to the aorta.

Labelled Diagram

OfHeart

Partition

Atria -: The upper two chambers of the heart are called atria.

Ventricles -: The lower two chambers of the heart are called ventricles.

Left ventricle -: It receives oxygenated blood from left atrium and pumps it into the aorta.

Right ventricle -: It receives deoxygenated blood from right atrium and pumps it into the pulmonary artery.

Left atrium -: It receives oxygenated blood from the pulmonary veins, and pumps it into the left ventricle.

Right atrium -: It receives deoxygenated blood from superior and inferior vena cava.

It can be pronounced cava or cva.

The superior vena cava is a large diameter, yet short, vein that carries deoxygenated bloodfrom the upper half of the body to the heart's right atrium. It is located in the anterior right superior mediastinum.

The main trunk of the systemic arteries, carrying blood from the left side of the heart to the arteries of all limbs and organs except the lungs.

The pulmonary artery carries deoxygenated blood from the heart to the lungs. It is one of the only arteries that carry deoxygenated blood.

The pulmonary veins are large blood vessels that carry oxygenated blood from the lungs to the left atrium of the heart.

Heart valves are flap – like structures which allow blood to flow in one direction. There are four valves in our human heart. They are:

Aortic valve

Mitral Valve

Pulmonary Valve and

Tricuspid Valve

Aortic valve prevents the back flow of blood as it is pumped from left ventricle to aorta.

Mitral valve prevents the back flow of blood as it is pumped from left atrium to left ventricle.

Pulmonary valve prevents the back flow of blood as it is pumped from right ventricle to pulmonary artery.

Tricuspid valve prevents the back flow of blood as it is pumped from right atrium to right ventricle.

The Cardiac Cycle is a sequence of events that occurs when the heart beats. It of two phases. They are :

Diastole phase

Systole phase

The heart ventricles are relaxed and the heart fills with blood.

The ventricles contract and pump blood to the arteries.