The Main Component of the Circularatory System in Humans

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THE MAIN COMPONENT OF THE CIRCULATORY SYSTEM IN HUMANS

            The human circulatory system has three important components that are 

interrelated. Three of these components are published for the transportation and 

reception of back to and from the whole body. Here are the three main components 

of the human blood circulation system:

1. Heart

        Blood cells are produced in the bone marrow. Well, the heart is the most vital 

organ in the circulatory system whose function is to pump and receive blood 

throughout the body. The location of the heart is between the lungs. Right in the 

center of the chest, on the left back of the breastbone. The size of the heart is 

approximately slightly larger than your fist, which is around 200-425 grams. 

Your heart consists of four chambers, namely the left and right chambers (atria) 

and the left and right chambers (ventricles). The heart has four valves that separate 

the four chambers. The heart valve functions to keep blood flowing in the right 

direction. This valve includes the tricuspid, mitral, pulmonary and aortic valves. 

Each valve has flaps, called leaflets or cusps, which open and close once each heart 

beats.

2. Blood vessels

        Blood vessels are elastic pipes that are part of the blood circulation system. 

The vessels function to carry blood from the heart to other parts of the body or vice 

versa. There are three main blood vessels in the heart, namely:

a.    Arteries, carry oxygen-rich blood from the heart to other body parts. Arteries 

have walls that are elastic enough to keep blood pressure consistent.

b.  Veins, this blood vessel carries oxygen-poor blood from the entire body to return 

to the heart. Compared to arteries, veins have thinner vessel walls.

c.   Capillary, this blood vessel is responsible for connecting the smallest artery with 

the smallest vein. The walls are so thin that it allows blood vessels to exchange 

compounds with surrounding tissue, such as carbon dioxide, water, oxygen, waste, 

and nutrients.

3. Blood

        The human body contains around 4-5 liters on average. Blood functions to 

transport nutrients, oxygen, hormones, and various other substances to and from 

your entire body. Without blood, we can be sure oxygen and food essence will be 

    difficult to distribute properly throughout the body. Blood consists of several 

    components, namely:

a.   Blood plasma

The blood plasma fills around 55-60 percent of the volume of blood in the body. 

The main task of blood plasma is to transport blood cells to be circulated 

throughout the body with nutrients, body waste products, antibodies, blood 

clotting proteins, and chemicals, such as hormones and proteins that are 

responsible for helping maintain body fluid balance.

b.  Red blood cells (erythrocytes)

Red blood cells carry oxygen from the lungs to circulate throughout the body. 

These blood cells are also responsible for transporting carbon dioxide from the 

entire body to the lungs to be expelled.

c.   White blood cells (leukocytes)

Even though it has a smaller amount than red blood cells, white blood cells carry 

out a non-playful task. White blood cells are responsible for fighting infections 

of viruses, bacteria and fungi that trigger the development of disease. This is 

because white blood cells produce antibodies that will help fight these foreign 

substances.

d.  Blood platelets (platelets)

Platelets have an important role in the process of blood clotting (coagulation) 

when the body is injured. Precisely, platelets will form blockages with fibrin 

thread to stop bleeding while stimulating new tissue growth in the injured area.

 

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