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CONTROL OF CIRCULATION, Afferent: Cranial nerve IX, X, Efferent:…

- - - - Receptors
        
        Reflex center
        
        Effector organs
        
        Heart and blood vessels
        
        Effector organs
        
        Carotid sinuses and aortic arch
    - - Receptors
        
        Carotid bodies and aortic bodies
        
        Reflex center
        
        Medulla
        
        Effector organs
        
        Heart and blood vessels
    - - Increase blood
        volume
        
        Stretch receptor
        
        Inhibit ADH*
        
        Vasodilation
- - - - Two theories
        
        Vasodilator theory
        
        Tissue metabolism เพิ่ม
        
        CO2,
        lactic acid, histamine
        
        Arteriole
        resistance ลด
        
        Blood flow เพิ่ม
        
        Oxygen demand theory
        
        Tissue metabolism เพิ่ม
        
        Tissue oxygen ลด
        
        Arteriole
        resistance ลด
        
        Blood flow เพิ่ม
    - - Metabolic theory
        
        Decrease arterial
        pressure
        
        Oxygen delivery decreases
        
        Release of vasodilators
      - Myogenic theory
        
        Decrease arterial
        pressure
        
        Decrease arteriolar wall
        tension
        
        Arteriole dilates