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Circulatory System

Circulatory System. Transport. Circulatory System. Transports nutrients, oxygen, and other substances to all cells in the body These substances are transported in blood Blood flows through a network of tubes called blood vessels A pump, the heart , keeps blood flowing through the vessels.

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Circulatory System

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  1. Circulatory System Transport

  2. Circulatory System • Transports nutrients, oxygen, and other substances to all cells in the body • These substances are transported in blood • Blood flows through a network of tubes called blood vessels • A pump, the heart, keeps blood flowing through the vessels

  3. Circulatory System • Humans have a double circulatory system • This means that blood needs to travel through the heart twice on one complete journey through the body

  4. DOUBLE Circ. System • Blood on the left side of the heart came from the lungs • We call it oxygenatedblood, because it has oxygen in it • Oxygenated blood is always colored RED

  5. DOUBLE Circ. System • The oxygenated blood then goes around the body, delivering oxygen to body cells • This means the blood becomes deoxygenated • Deoxygenated blood is colored BLUE

  6. When deoxygenated blood reaches the heart it gets pumped to the lungs. Because the lungs are so close, blood is pumped at a _____ pressure (force) When oxygenated blood reaches the heart it gets pumped to the rest of the body. Because the body cells can be far away, blood is pumped at a _____ pressure (force) DOUBLE Circ. System

  7. Circulatory System review • What are 2 substances carried by the blood? • Blood travels through tubes known as what? • How many times does blood go through the heart in one complete circuit? • What kind of blood do we color red? Blue? • Why is there a pressure difference in blood going to the lungs, and going to the body?

  8. Heart • The function of the heart is to pump blood around the body. • The heart is made of a special type of muscle called cardiac muscle. • Your heart is about the same size as your fist. • It pumps over 5,000 quarts of blood every day

  9. Heart • The heart is divided into four chambers. • The two upper chambers are known as Atria (singular: atrium) • The two lower chambers are known as Ventricles • The left and right sides of the heart are completely separated by a septum.

  10. Heart YouTube Video

  11. Heart • It is very important that oxygenated and deoxygenated blood DO NOT MIX. • This is achieved by having a septum that separates the left and right side of the heart • and… • By having valves that separate the atrium from the ventricle

  12. Tricuspid Valve Separates the right atrium and ventricle Has 3 parts or flaps Bicuspid Valve Separates the left atrium and ventricle Has 2 parts or flaps Heart Valves

  13. Heart Valves • Semilunar Valves Prevents blood from flowing back into the ventricles

  14. How does the heart get the nutrients and oxygen it needs? • Blood does not spend enough time in the atria or ventricles to let oxygen and other nutrients fully diffuse to all the cells.

  15. Coronary Arteries • On the outside of the heart are blood vessels that supply the cardiac muscle with oxygen and nutrients. • They are called Coronary Arteries

  16. Coronary Arteries • If a coronary artery gets blocked (by a blood clot, plaque, etc.) the cardiac muscles run short of oxygen. • If they don’t have oxygen they can’t respire. • This causes the heart to stop beating, otherwise known as a heart attack or cardiac arrest.

  17. Coronary Heart Disease • Blockage of the coronary arteries is called Coronary Heart Disease.

  18. Coronary Heart Disease • Very common cause of death (25%) • There are several factors that increase a person’s risk of getting this disease. • Diet • Smoking • Stress • Inactivity • Genes • And many others

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