In episode 57, Leslie Samuel discusses pressure reflexes and mean arterial pressure. The episode covers the anatomy of the heart, aorta, and carotid artery, focusing on baroreceptors that detect pressure changes. When mean arterial pressure increases, baroreceptors send signals to the medulla, leading to increased parasympathetic and decreased sympathetic activity. This results in reduced cardiac output and peripheral resistance, ultimately lowering mean arterial pressure. The episode concludes by explaining the reflex nature of this process.

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