A patient stands up quickly after lying down for several hours and briefly experiences dizziness. Which physiological mechanism is primarily responsible for restoring arterial blood pressure within seconds?

• A. Chemoreceptors in peripheral tissues detect reduced oxygen levels and directly increase stroke volume
• B. Stretch receptors in the carotid sinus decrease their firing rate, leading to increased sympathetic output
• C. Osmoreceptors in the hypothalamus stimulate water retention to immediately increase blood volume
• D. Coronary artery receptors activate parasympathetic pathways that constrict systemic arteries

Answer: (B)