circulatory system

• blood vessels organised into a continuous circulatory system
• heart:

  1. artery

  2. vein

  3. left atrium

  4. vulves

  5. left ventricle
• humans have a double circulatory system because blood flows through the heart twice each circuit of the body

  One loop carries blood from the heart to the lungs and back again to collect oxygen
• -

  
• artery

  function:

  carries blood away from the heart = high pressure

  adaptations:

  can stretch and recoil
• capillary: (stretched out and small)

  function: link the arteries to the veins

  adaptations: one cell thick and a short diffusion difference
• vein: bigger inside thingy

  function: carry blood in the heart

  adaptation: valves stop blood from flowing back the way it came- low pressure
• one loop (left) carries deoxygenated blood FROM the heart to the lungs, gains oxygen and flows back to the heart
• loop 2 ( right red) carries oxygenated blood to the rest of the body, and then gives the oxygen to the tissues becoming deoxygenated and then flows back to the heart to start over again