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CARDIOVASCULAR SYSTEM (DISORDERS (murmur (irregular heart beat sounds; can…

- - - - directly connects an arterole to a venule
    - - gas exchange by diffusion (high to low concentration)
- - - - discharges blood to rest of body
    - - receive blood from rest of body that is low in O2
    - - receives blood from lungs that is highly O2
    - - discharges blood to lungs
  - - - bicuspid ( mitral) has 2 flaps and stops blood from leaving the Left ventricle
      - tricuspid valve. has 3 flaps and stops blood from leaving the Right ventricle
    - - pulmonary semilunar valve. B/W right vent. and pulmonary trunk that stops blood from going back to R. Vent.
      - aortic semilunar valve. B/W left vent. and aorta that stops blood from going back to L. Vent.
- - - - branches into Arterioles
        
        which are "small arteries" found b/w arteries and capillaries
        
        capillaries are smallest blood vessels and sites of gas exchange b/w blood and tissue cells
  - - - veins return blood toward the heart
- - - - blood pressure builds before ventricle contracts, pushing out blood
    - - atria finish refilling , ventricular pressure is low
    - - the starting point where blood flows into ventricles