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TRANSPORT IN HUMANS, tricuspid valve opens, semi lunar valves open,…

- - - - transports oxygen in the form of oxyhaemoglobin
    - - medium for substances to be dissolved to be transported
  - - - phagocytes
        
        carry out phagocytosis to engulf & digest foreign particles
      - lymphocytes
        
        secretes antibodies which can protect body frm pathogens
    - - helps in blood clotting (secrete thrombokinase)
- - - - deoxygenated blood is transported
        into the heart via the vena cava
        
        muscular wall of the right atrium relax
        
        blood from the vena cava enters the
        right atrium
        
        muscular wall of the right atrium
        contract (atrial systole)
        
        blood pressure in the right atrium is
        higher than that of the right ventricle
        
        blood is forced from the right atrium
        into the right ventricle
        
        1 more item...
      - oxgenated blood is transported into
        the heart via pulmonary vein
        
        muscular wall of left atrium relax
        
        blood from pulmonary vein enters left atrium
        
        muscular wall of left atrium contract (atrial systole)
        
        blood pressure in left atrium higher than that of left ventricle
        
        blood is forced from left atrium into left ventricle
        
        1 more item...
- - - - plague narrows lumen of blood capillary
        
        increses blood pressure & rough surface created
        
        increase risk of blood clotting
        
        reduce or completely block blood flow to cardiac muscles
        
        heart attack