242 The Respiratory System 6. The following diagram depicts a systemic capillary around cells in a body tissue. The presence of each respiratory gas in each site is shown, indicated as PO, or PCO, a) For each gas in each site, indicate whether the partial pressure is "high" or "low," and then use an arrow to show the direction of diffusion of each gas Syscaplary PO₂ -PO₂ Body cel -POD POO₂

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