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The Circulatory System

The Circulatory System. OB14, OB15. Understand the structure and function of the heart, identify the four chambers of the heart, and explain the difference between the left and right ventricles

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The Circulatory System

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  1. The Circulatory System

  2. OB14, OB15 • Understand the structure and function of the heart, identify the four chambers of the heart, and explain the difference between the left and right ventricles • Describe the passage of blood through the heart and lungs via arteries and veins, identify the pulmonary artery and vein, aorta and vena cava, and distinguish between arteries, veins and capillaries

  3. There are THREE types of blood vessels • ARTERIES • Carry blood away from the heart • Thick, muscular, stretchy wall • Narrow central tube

  4. VEINS • Carry blood towards the heart • Thin walls with little muscle • Wide central tube • Have valves stop the blood flowing backwards

  5. Circulatory system Artery – red Vein - blue LUNGS HEART ARTERY carrying oxygenated blood to leg VEIN carrying deoxygenated blood back to heart

  6. CAPILLARIES • carry blood between arteries and veins • wall only one cell thick • very narrow central tube

  7. All Blood Vessels

  8. The Heart • Thick muscular walls • Divided into 4 chambers • Right side pumps blood to lungs • Left side pumps oxygenated blood from the lungs to ALL parts of body

  9. Right Atrium Left Atrium Left Ventricle Right Ventricle The heart is divided into FOUR chambers

  10. PULMONARYVEIN VENA CAVA AORTA PULMONARYArtery To lungs To body From body From lungs VENA CAVA The heart has four major blood vessels

  11. Where can we find a pulse? A healthy heart at rest will beat 70 times every minute The pulse can be felt at:

  12. ..\..\..\blood around body\Blood around body.exe

  13. Heart

  14. Inside every cell oxygen is added to glucose in RESPIRATION to produce WATER + CARBON DIOXIDE + ENERGY

  15. Draw a flow chart • Show the route of a red blood cell • Starting at lungs and moving via heart to arm • Leaving the arm and returning back to the lungs • Labelled oxygenated blood cells (red), deoxygenated blood cells (blue), the heart, lungs, arteries and veins

  16. The Blood • The blood has three main purposes • Transport stuff around the body (Food, Oxygen, Carbon Dioxide and Urea) • Defence (White Blood Cells) • Clotting (Platelets)

  17. Parts of the Blood • Plasma – This is the name for the liquid that all the cells float in. Mostly water with Glucose, Protein and Urea dissolved in it.

  18. Parts of the Blood • Red Blood Cells – Carry the oxygen around the body. The oxygen combines with HAEMOGLOBIN to turn the blood red. When there is no oxygen in the Haemoglobin it turns purple.

  19. Parts of the Blood • White Blood Cells – Eat the bacteria that invade the body. Forming the main part of the IMMUNE SYSTEM. • Some can also produce anti-bodies.

  20. Parts of the Blood • Platelets – Allow the blood to clot by all rushing to the injury.

  21. All Blood Vessels

  22. Left side muscle is thicker as it has to pump the blood to all parts of the body. The right side just takes it to the lungs

  23. Blood Summary

  24. The blood mobile • Nominated for 6 Oscars by ……..

  25. H/W • P54 • 1,2,3,6,7

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