If the goal is to increase blood flow to the digestive system without altering systemic blood pressure, which adjustment is most appropriate?

If the goal is to increase blood flow to the digestive system without altering systemic blood pressure, which adjustment is most appropriate?

• A. Increase heart rate globally
• B. Dilate mesenteric vessels
• C. Decrease stroke volume
• D. Increase respiratory rate

Answer: (B)

To selectively boost blood flow to the digestive system while keeping systemic blood pressure steady, you would lower the resistance in the mesenteric (splanchnic) vascular bed. By dilating the mesenteric arteries, the resistance in that specific regional circulation decreases, so more blood can flow to the gut for digestion without changing the overall arterial pressure much. The other options would either raise global cardiac output (increasing heart rate) or reduce it (decreasing stroke volume), or affect breathing in a way that doesn’t selectively increase gut perfusion. They don’t provide a targeted increase in gut blood flow without altering systemic pressure, whereas selective mesenteric vasodilation accomplishes the goal.

To selectively boost blood flow to the digestive system while keeping systemic blood pressure steady, you would lower the resistance in the mesenteric (splanchnic) vascular bed. By dilating the mesenteric arteries, the resistance in that specific regional circulation decreases, so more blood can flow to the gut for digestion without changing the overall arterial pressure much.

The other options would either raise global cardiac output (increasing heart rate) or reduce it (decreasing stroke volume), or affect breathing in a way that doesn’t selectively increase gut perfusion. They don’t provide a targeted increase in gut blood flow without altering systemic pressure, whereas selective mesenteric vasodilation accomplishes the goal.