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Circulatory System

Circulatory System. 1/8/2010. Function. To supply oxygen all over your body. The circulatory system is made up of the vessels and the muscles that control the flow of blood through the body. The main parts of the system are the heart, arteries, arterioles, veins, venules, and capillaries .

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Circulatory System

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  1. Circulatory System

    1/8/2010
  2. Function To supply oxygen all over your body
  3. The circulatory system is made up of the vessels and the muscles that control the flow of blood through the body. The main parts of the system are the heart, arteries, arterioles, veins, venules, and capillaries.
  4. Capillaries The capillaries connect the venules and the arterioles. The capillaries are only one cell thick. This thin layer allows molecules of oxygen, water, and lipids to pass through and enter the tissues. Waste products such as carbon dioxide and urea can pass back into the blood to be carried away for removal from the body.
  5. Through the heart As blood begins to circulate, it leaves the heart from the left ventricle and goes into the aorta. The aorta is the largest artery in the body. The blood leaving the aorta is full of oxygen. The oxygen rich blood travels throughout the body in arteries which break into smallest arterioles.
  6. On its way back to the heart, the blood travels through a system of veins and venules. As it reaches the lungs, the carbon dioxide (a waste product) is removed from the blood and is replaced with fresh oxygen that has been inhaled through the lungs. Hemoglobin is a protein in red blood cells that carries oxygen. Without hemoglobin, the oxygen would not be carried in the blood and would have no way to get to the cells.
  7. Arteries and Veins A rule of thumb is that arteries take blood away from the heart and the veins bring blood back to the heart. A= Away: it is arteries So, veins= towards the heart
  8. The anatomy of the heart There are four cavities or open spaces inside the heart that fill with blood. The two upper cavities are the atria and the two lower cavities are the ventricles.
  9. Red blood cells– contain hemoglobin which combines with oxygen. These cells deliver oxygen to the body. Their disc shape helps them squeeze through capillaries. They wear out and are replaced every four months. New red blood cells are produced in the bone marrow. White blood cells– are generally larger than red blood cells. They can move out of your blood through the capillary walls into tissue fluid and lymph. They then travel around fighting disease. The white blood cells last 13-20 days after which they are destroyed by the lymphatic system. Platelets– are irregularly-shaped, colorless bodies that wear out within 5-10 days. Their sticky surface. Fibrinogen form clots to stop bleeding.
  10. WBC = White Blood Cells RBC = Red Blood Cells Platelets The rough, long structure is a platelet. Blood Composition 55% Plasma 1% White Blood Cells and Platelets 45% Red blood Cells
  11. Flow of Blood Left Ventricle, Aorta, Body, Right Atrium, Right Ventricle, Pulmonary Artery, Lungs, Left Atrium, Left Ventricle
  12. Pulse Lab Find your pulse. Count your pulse for 15 seconds. Multiply that number by 4. Record answer in lab journal. Stand up and do Jumping Jacks for 3 minutes. Find your pulse. Count your pulse for 15 seconds. Multiply that number by 4. Record answer in lab journal. Stand up and do arm circles for 3 minutes. Find your pulse. Count your pulse for 15 seconds. Multiply that number by 4. Record answer in lab journal.
  13. In your journal, write the questions and answer them in complete sentences. What is the relationship between physical activity and pulse rate? Which activity caused their pulse rate to increase the most? Why do you think activity caused the heart to pump faster?
  14. Heart Worksheet You may use your notes to help you fill out the parts to the heart.
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