Circulatory System And Its Functions

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00:00Hi kids! Today we will learn about the human circulatory system. So let's start.

00:12Organ system consisting of heart, blood, and all blood vessels is called

00:19circulatory system. Circulatory system circulates blood throughout the body.

00:29The blood circulates nutrients and other essential materials to cells and also

00:37removes waste materials from the cells. But what are these cells? The body of all

00:45living beings, humans, birds, plants, and animals are made up of some basic small

00:53units which are called cells. Cells are very small microscopic structures and

01:01is the smallest living unit. It's the cells that take in oxygen and nutrients

01:09from the blood and produce energy for the working of the cell. Carbon dioxide

01:16and waste are also produced in this process. It is the blood that provides

01:24cells with oxygen and nutrients to produce energy that we need in our daily

01:31lives for every activity. And it's also the blood that removes the waste and

01:37carbon dioxide from the cells. And this system of circulating blood throughout

01:46the body to each and every cell is called circulatory system. And the main

01:54parts of this circulatory system are heart, blood, and the vessels. Vessels can

02:03be arteries, veins, or capillaries. Circulatory system is also called

02:11cardiovascular system. Let's learn the main functions of circulatory system.

02:21Transportation. The cardiovascular system or the circulatory system

02:29transports blood to all the cells of the body and to each and every cell and

02:37removes waste and carbon dioxide from each and every cell. Hormones too are

02:47transported throughout the body via the blood's liquid portion that is plasma.

02:56Next important function of the circulatory system is protection. It

03:03protects the body through its various cells. White blood cells also known as

03:12leukocytes play a very important function in the body's immune system.

03:19They fight off viral infections, produce antibodies against infections, and also

03:27engulf and ingest pathogens and the dead cells from wounds and infections.

03:34Platelets present in the blood also known as thrombocytes are responsible

03:40for clotting of the blood and the formation of scabs on wounds to stop

03:47bleeding. So our circulatory system is responsible for protection from diseases

03:56and also prevents excessive loss of blood from our body. Next very important

04:06function of our circulatory system or cardiovascular system is regulation.

04:15Our blood regulates the temperature of our body. Our body maintains a constant

04:23temperature due to its cardiovascular system or the circulatory system as when

04:29the weather is very hot the blood vessels near the skin surface dilates to

04:35allow excess heat from the body to escape to the surrounding and when it's

04:41too cold outside the blood vessels constrict to keep the blood flowing only

04:47to vital organs and also do not let much heat escape from the body. And this way

04:56our blood regulates the body temperature. So circulatory system is an amazing

05:05highway along with the nutrients gases and waste materials travels the entire

05:13body and it connects all the cells of our body. Now let's try to understand how

05:21this circulatory system works. When we breathe what happens? We inhale oxygen

05:29rich air that goes into our lung. Now this oxygen mixes with the blood and

05:35this oxygen rich blood or oxygenated blood goes to the heart. Our heart pumps

05:43this oxygenated blood to each and every cell of our body and then in every cell

05:50this oxygen is used to carry out the metabolic activities and carbon dioxide

05:57and waste is produced which is again given back to the blood. And this

06:04deoxygenated blood again goes back to the heart. Heart then pumps this

06:10deoxygenated blood to the lungs where oxygen is added to the blood. So this way

06:18the whole circulatory system goes on. So kids today we learned a lot about our

06:26circulatory system. Now you may go ahead and take a quiz to learn more. Bye bye.

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