During exercise, systemic blood flow (cardiac output; liters/min) may be four times higher than at rest. Surprisingly, pulmonary blood flow is the same as systemic blood flow, but pulmonary resistance to flow is six times lower than the systemic resistance to flow. Use the relationship MAP = (cardiac output)*(resistance) to show that mean pulmonary pressure is six times less than mean systemic pressure. (

Explanation:

During exercise, cardiac output can reach to 35L/min.

Mean systemic pressure is the systemic pressure in the absence of blood, which can be 12 mmHg in dogs.

Mean pulmonary pressure during rest is > 25 mmHg and can reach >30mm Hg during exercise.

Total peripheral resistance is generally 9 mmHg·min/l and reaches to 20 mmHg·min/l during exercise.

During exercise the mean arterial pressure, MAP = 35L/min x 20 mmHg·min/l

MAP = 700 mmHg

Therefore, the mean arterial pressure is more than six times of Mean pulmonary pressure during exercise.

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