GCSE PE The Circulatory System

GCSE PE The Circulatory System

1. THE CIRCULATORY SYSTEM

   • MOVEMENT OF BLOOD
     • PULMONARY CIRCULATION
       • This is where blood becomes oxygenated
         • Deoxygenated blood travels from the heart to the lungs.
           • Blood is oxygenated
             • Blood then travels back to the heart to be pumped (delivered) around the body.
     • SYSTEMIC CIRCULATION
       • Oxygenated blood travels around the body to the cells where it is needed
         • Oxygenated blood (02) is delivered & Deoxygenated Blood (CO2) is picked up
           • This is then carried back to the heart.
     • 2
   • THE HEART
     • The Heart contracts and relaxes pumping blood around the body. This is called a heartbeat.
     • A performer's heartbeat will increase with exercise.
       • WHY???
     • 1
   • 3 COMPONENTS
   • BLOOD VESSELS (3 TYPES)
     • CAPILLARIES
       • LINK the Arteries to the Veins
       • Extremely thin walls to allow 02 & CO2 Pass through their walls
     • VEINS
       • CARRY DEOXYGENATED BLOOD - C02
       • THINNER WALLS THAN ARTERIES
       • Valves ensure that blood does not flow backwards
     • ARTERIES
       • CARRY OXYGENATED BLOOD - 02
       • THICK WALLS
       • No Valves
     • 3

2. OTHER FUNCTIONS OF THE SYSTEM

   • PROTECTION
     • Antibodies carried in the blood to fight infection.
     • Blood clots to seal cuts and wounds.
   • REGULATES BODY TEMPERATURE
     • Blood absorbs body heat and carries it to the lungs and skin to be released.

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