By Puja and Anjali

CIRCULATORY SYSTEM

Circulatory system – Circulatory system is a cycle/process in our body like a transport system which transfers blood to all the organs.

What is Circulatory System?

Blood is a life maintaining fluid which is connected to all our body parts. It carried nutrients and oxygen, it also carries red blood cells, white blood cells, platelets and plasma which helps it. There is 22% of solid in the blood and 78% of water.

What is blood?

RBC is also called Erythrocytes. It is a cell which is red in colour. It carries oxygen, carbon dioxide and hemoglobin. The hemoglobin makes the blood red. There are 250 million Erythrocytes in our body. it is made up of bone marrow.

Red Blood Cells

WBC is also called leukocytes. It is a cell which is white in colour. WBC fights with infections. There are 3,75,00 WBC in our body and 500 RBC/1WBC. It is made up of bone marrow.

White Blood Cells

Platelets is also called thrombocytes. Which helps the blood to clot and not flow out of our body. There are 16 million platelets in our body. It is the smallest cell in our body.

Platelets

Plasma is a yellow fluid/ liquid. Half of the blood is plasma. It carries protein, sugar, salt and hormone.

Plasma

The biggest artery is Aorta. It carries oxeygen rich blood and takes blood away from the heart. Arteries inner layer is very smooth so the blood can flow easily. The biggest artery is like our thumb and the smallest is thinner then the hair.

Arteries

The biggest vein in our body is venacava. It carries oxygen impure blood. It has thin walls than attires. It carries blood to the heart. The smallest vein is venues.

Vein

Capillaries is a smallest tube in our body. It helps connects arteries ands veins. Capillaries are very thin and fragile unlike the arteries and veins. The exchange of oxygen and carbon diaoxied takes place through them.

Capillaries

There are 4 valves in our heart. Which help the blood to pass in the heart and in the right direction. the four valves our pulmonary, aortic, tricupid and mitral valve. They are in the four chambers.

Valve

The kidneys are bean shaped organs which function is to take the waste from the blood and make it into urine. it is located near the middle of the back just below the rib cage. One on each side of the spine.

Kidney

The heart is a cardiac muscle and the strongest muscle. It has 4 chambers the right ventricle, left ventricle, right atrium and left atrium. The heart pumps blood 120 time in a child’s body. In a year it pumps 35million times. There is a mini system in the heart which is called cardio vascular system. It helps to make the blood pure in the heart. There are also arteries on heart. Its the size of our fist.

Heart

First the impure blood passes through the superior venacava and then to the right atrium then passes to the valve and comes to the right ventricle. Then it passes through pulmonary artery and goes to the lung. The lungs take carbon dioxide and gives it oxygen and the impure blood turns into pure blood. Then it goes to the pulmonary vein and goes to the left atrium. Then it goes to the left ventricle and passes through the aorta passes the pure blood to all other organs.

Process

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