Circulatory system

The circulatory system is also known as the cardiovascular or transportation system. It carries oxygen and nutrients throughout the body; carries waste away from cells and produces cells to fight infection.
It consists of the heart, blood vessels, blood and the spleen.

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How it works:

Blood travels away from the heart in arteries and towards the heart in veins. A drop of deoxygenated blood will start in the capillaries at any part of the body and move into venules and into the veins which will go into a larger vein to meet with the superior/inferior vena cava depending on part of the body. Then it enters the heart through the Right atrium and into the right ventricle to the pulmonary arteries and to the lungs to get oxygenated the then oxygenated blood will go through the pulmonary veins to the left atrium, the left ventricle. The blood then goes through the aorta to be distributed throughout the bodies arteries to the capillaries to restart the exchange.

Blood Cells:

Leukocytes (White Blood Cells):

Cells that help the body fight infections and other diseases. Also called white blood cells (WBCs).

Erythrocytes (Red Blood Cells):

A cell that contains hemoglobin and can carry oxygen to the body. Also called a red blood cell (RBC). The reddish color is due to the hemoglobin.


A platelet. Crucial to normal blood clotting.

Hemoglobin (Part of Erythrocytes):

Hemoglobin transports oxygen from the lungs to the rest of the body

Diseases of the Circulatory System:


A condition in which you don't have enough healthy red blood cells to carry adequate oxygen to your tissues.


cancer of your body's blood-forming tissues, including your bone marrow and lymphatic system. It usually starts in your white blood cells.

Myocardial Infarction (Heart Attack):

A heart attack usually occurs when a blood clot blocks the flow of blood through a coronary artery — a blood vessel that feeds blood to a part of the heart muscle. Interrupted blood flow to your heart can damage or destroy a part of the heart muscle.


A permanent cardiac or arterial dilatation usually caused by weakening of the vessel wall.


A complete blood count is used to help analyze the blood, it consists of a red cell count, white cell count, hematocrit, hemoglobin, and blood smear study including differential white cell count. Red blood cells, or Erythrocytes, contain hemoglobin and give the blood the red color. It is basically for transport. White blood cells, or leukocytes, are found within tissues, where they fight infections, and in circulation. There are different types of leukocytes which all fight different kinds of infections and abnormalities. Hemoglogin is a protein which can take oxygen and carbon dioxide and deliver it throughout the body. Hematocrit tests are percentages of red cells to whole blood.

Interesting Facts:

Red blood cells make approximately 250,000 round trips of the body before returning to the bone marrow, where they were born, to die.

Your heart beats about 70 times a minute, and each time it beats, it pumps about a cupful of blood.


CBC values: