Category Archives: Albert Setiawan

Circulatory System


       Have you ever cut yourself accidentally? What came out of the wound? The fluid that came out of your wound is blood.
Blood is red and quite viscous (thick). Blood is called the fluid of life. If you had no blood, you would not be alive. Blood reaches the different parts of your body, through your circulatory system.

Now in this blog you will learn more about the circulatory system.

Without your being aware of it, your organ systems are working continuously to keep you alive. One of these organ systems is the circulatory system.

 The circulatory system is an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases and help stabilize body temperatureto maintain homeostasis. it is made up of the vessels and the muscles that help and control the flow of the blood around the body. This process is called circulation. The main parts of the system are the heart, blood vessels and blood. I’ll explain first about:

  •  Heart

 heart is located in the center of your chest slightly to the left. It’s job is to pump your blood and keep the blood moving throughout your body.when heart relax, it fills with up the blood, when it contracts it squeezed out the blood with a great force.

 Heart consist of 4 chamber: right atrium, right venticle, left atrium and left ventricle. Right atrium consist of deoxygenated blood from various part of the body after that the right ventricle pumps the deoxygenated blood from the pulmonary arch to heart and lungs. Then the job for the left ventricle is to carries oxygenated blood from the lungs then moves to the left ventricle to be pump to all parts of the body.

 In heart, there are also types of circulation such as double circulation which means the blood passes through the heart twice in one complete circuit. Then it divides become 2: pulmonary and systemic circulation. Pulmonary circulation is when the blood flows from the body then to heart then to lungs and back to the heart again. While systemic circulation means the circulation of blood around the body.

 we can keep our heart healthy by:

  1.  Exercise on a regular basis. Get outside and play. Keep that body moving (walk, jog, run, bike, skate, jump, swim).
  2. Eat Healthy. Remember the Food Pyramid and make sure your eating your food from the bottom to top.
  3. Don’t Smoke!
  • Blood

            For many people, they only think that blood only consist of red fluid, but this is actually wrong. There are several types of blood beside red blood cell, there are also white blood cell, plasma and also platelets.

 Red Blood Cells

 Red Blood Cells are responsible for carrying oxygen and carbon dioxide. Red blood cell are also called as erythrocytes. This are some feature of red blood cell: they have haemoglobin, the function of it is to combine with oxygen. It also has a biconcave shape so that the red blood cell can absorb and release oxygen at faster rate. Haemoglobin that  already combine with oxygen are called oxyhaemoglobin. Red blood cell also produced by bone narrow and it could live until 3-4 months, after that the red blood cell will be destroy by spleen.

White Blood Cells

 White Blood Cells help the body fight off germs. White Blood Cells attack and destroy germs when they enter the body. When you have an infection your body will produce more White Blood Cells to help fight an infection. White blood cell are also called as leucocytes. White blood cell have 2 main kinds those are: lymphocytes and phagocytes. The function of lymphocytes is to produce antibodies from disease causing mocroorganism.while phagocytes ingest and digest phatogens or bacteria.


Platelets are blood cells that help stop bleeding. When we cut ourselves we have broken a blood vessel and the blood leaks out. In order to plug up the holes where the blood is leaking from the platelets start to stick to the opening of the damaged blood vessels. As the platelets stick to the opening of the damaged vessel they attract more platelets, fibers and other blood cells to help form a plug to seal the broken blood vessel. When the platelet plug is completely formed the wound stops bleeding. Other name for platelets is thrombocytes.


 Plasma is the liquid part of the blood. Approximately half of your blood is made of plasma. The plasma carries the blood cells and other components throughout the body. Plasma is made in the liver.

  •   Blood Vessel

               Blood vessel are part of ciculatory system that transport blood throughout the body


 Arteries are blood vessels that carry oxygenated blood away from the heart. Arteries have branches called as arteriolesarteries have thick walls than veins.


 Capillaries are tiny blood vessels as thin or thinner than the hairs on your head. Capillaries connect arteries to veins. Food substances(nutrients), oxygen and wastes pass in and out of your blood through the capillary walls.


 Veins carry blood back toward your heart. Veins have branches called venules and have thinner walls.

Here are some fun FACTS :

  • One drop of blood contains a half a drop of plasma, 5 MILLION Red Blood Cells, 10 Thousand White Blood Cells and 250 Thousand Platelets.
  • You have thousands of miles of blood vessels in your body. “Bill Nye the Science Guy” claims that you could wrap your blood vessels around the equator TWICE!
  • Keep your heart healthy…it’s going to have to beat about 3 BILLION times during your lifetime!

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Posted by on May 2, 2011 in Albert Setiawan