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You will measure pulmonary blood flow while the subject is on his back (supine). Which of the following is a likely consequence of posture?a. The lungs will be mostly zone 3: P arterial > P venous > P alveolarb. The lungs will be mostly zone 2: P arterial > P alveolar > P venousc. The lungs will be mostly zone 1: P alveolar > P arterial > P venousd. It cannot be predicted from the information given.

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