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The Circulatory System. Miss Johnston. What is the Circulatory System?. The circulatory system pumps blood around the body. The blood contains oxygen. WRITE THIS DOWN. What is the role of the circulatory system. The role of the circulatory system is to carry materials to and from cells.

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The Circulatory System

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    1. The Circulatory System Miss Johnston

    2. What is the Circulatory System? • The circulatory system pumps blood around the body. • The blood contains oxygen WRITE THIS DOWN

    3. What is the role of the circulatory system • The role of the circulatory system is to carry materials to and from cells. • The many cells of our body need to be nourished with food and oxygen and have their waste products removed. • Heat is generated from our muscles and other organs and is transferred by the blood to keep us warm.

    4. Heart Beat • Your Heart beats.. Every moment Of every day Of your life • What does a doctor use to listen to your heart? • A stethoscope

    5. What is a pulse? • When the heart beats, it forces blood along tubes called arteries. • In some places we can feel the blood being forced along, this is called a PULSE.

    6. Where can we feel our pulse?

    7. Can you feel your pulse? • YOUR TURN • Where can we feel our pulse?

    8. EXPERIMENT • Aim: To determine your resting heartbeat Work in pairs- one person counts for 30 secs using stopwatch, other person counts pulse • Try to feel the pulse in your wrist use your index and middle finger. (WHY?) • Count how many beats in a 30 seconds • How many beats in 60 seconds?

    9. Whats your heart rate? • What is your heart rate? • Normal rates are about 60-100 beats per minute

    10. How can we change our heart rate? • Exercise? • Run on the spot for 30 seconds • And then measure your pulse for 30 seconds • Work out your heart rate/ minute • Compare your resting heart rate with your running heart rate.

    11. Comparison of Class heart rate

    12. What components make up the circulatory system?? • Heart • Vein • Arteries • Capillaries

    13. Blood Vessels Compare the three types of blood vessels

    14. Arteries have the largest muscle layer • Veins have valves whereas arteries and capillaries don’t. • Capillaries are the thinnest and smallest and only have two layers of tissue. • How does this relates to their function?

    15. Arteries pump blood away from the heart to the rest of the body, this is why they have the most muscle. • Capillaries are delicate networks where cells exchange materials. • Veins carry blood moving back to the heart.

    16. The heart • Is a Muscle and Pump • It pumps blood around the body • The average adult has 5 litres of blood

    17. The Circulation system The Lungs Blood takes up oxygen Goes to other parts of the body

    18. Head and Arms Liver and Digestive Tract Kidneys Legs

    19. Parts of the heart

    20. Homework • Finish off heart model and stick in book • Label using arrows showing blood flow in the heart.