During standing, in apex of lung: (A) Blood flow is high, (B) Ventilation is high, (C) V/Q is high, (D) V/Q is low
Answer is C. In respiratory physiology, the ventilation/perfusion ratio (V/Q ratio or V/Q ratio) is a ratio used to assess the efficiency and adequacy of the matching of two variables: V or V - ventilation - the air that reaches the alveoli. Q or Q - perfusion - the blood that reaches the alveoli the capillaries Ref: guyton and hall textbook of medical physiology 12 edition page number:331,332,333