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Circulatory System, image, image, image, image, image - Coggle Diagram

- - - - are the smallest blood vessels and take the blood to every cell in an organ.
      - Extremely thin wall: tunica intima
      - low pressure, extremely narrow lumen diameter
      - none valves, no muscles and elastic fibres
    - - carry deoxygenated blood from the body to the heart.
      - Heart pressure
      - Send blood to heart
      - Thin wall: Tunica adventita, tunica media and tunica intima
      - Large amounts of muscle and elastic fiber
      - No valves
    - - carry oxygenated blood from the heart to the body.
      - thick wall: tunica adventita,tunica media, tunica intima
      - high pressure, narrow lumen diameter
      - no valves and large amount of muscle and elastic fiber
  - - - transport nutrients, CO2, urea, glucose, hormones and amino acids.
    - - ( erythrocytes) transport oxygen
    - - (leukocytes) fight infections
    - - clots blood at injury sites
    - - No nucleus or mitochondria (extra room)
      - Full of haemoglobin
      - Biconcave disk shape (more flexibility)
  - - - cluster of cardiomyocytes that control heartbeat called the sinoatrial node
        
        it ensures there is a delay between the atrial and ventricular contractions
      - has the right atrium, vena cava, tricuspid valves, right ventricle and pulmonary artery
      - pumps deoxygenatd blood (pulmonary circulation)
    - - has the left atrium, pulmonary vein, mitral valves, Aorta
      - pumps oxygenated blood (systemic circulation)