Circulatory system by Daniel Hall-Clark

The circulatory systems includes the heart,blood, red and white blood cells The function of circulatory system is to transport blood and oxygen from the lungs into tissues in the body.
The artery carries blood away from the heart. If you have a healthy artery it's strong and stretchy, they narrow between heart beats and they keep your blood pressure consistent and helps move through your body. The veins has thinner walls than the capillary and it widens when the blood increases and passes through. The capillary has a thin wall to let substances to pass through. The function of the capillaries is to deliver nutrients and oxygen to the tissues and they remove carbon dioxide and water.
The heart has four chambers the right and left atrium and the right and left ventricles. The right and left atrium receives blood that returns to the heart, and the right and left ventricles pumps blood away from the heart.
Red blood cells looks like a disc with pinched centers. It carries oxygen to all body cells. White blood cells fights of disease's. Some white blood cells recognize disease causing organism (bacteria) and alerts the body.
Platelets are important for forming blood clots. When a blood vessel gets cut platelets collect and sticks to the wound. Then it releases fibrim an weaves a network of fiber across the cut and traps blood platelets and red blood cells.
The plasma carries broken down digested food like glucose and fats. It transports vitamins, and chemical messengers, also waste products are carried away by plasma.
Red and white blood cells and platelets produces in the bone marrow. There are two types of white blood cells T and B cells produces in the lymph nodes and spleen. In the bone marrow all cells originate from a stem cell. Then when the stem cell divides the red and white blood cells and platelets becomes immature cell divides. Then it matures further and becomes a mature red or white blood cells, or platelets.
Blood pressure is a measure of how much pressure is against the vessels walls by the blood. It's measured by sphygmometer, it's placed around your arm and inflated with a pump until your circulation is cut off. Then it slowly deflates and measures it with a stethoscope to listen for the sound of blood through the arteries.

The disease for the circulatory system is DVT (deep vein thrombosis),,,,,,,, https://www.urmc.rochester.ed, Biology book pages 992-999

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