A patient experiencing significant blood loss develops hypotension. Which of the following compensatory mechanisms is primarily responsible for increasing total peripheral resistance to maintain blood pressure?

The correct answer to the question "A patient experiencing significant blood loss develops hypotension. Which of the following compensatory mechanisms is primarily responsible for increasing total peripheral resistance to maintain blood pressure?" is Option C: Activation of the renin-angiotensin-aldosterone system..

The other options — A) Decreased sympathetic outflow to resistance vessels., B) Release of atrial natriuretic peptide (ANP)., D) Increased parasympathetic tone to the heart. — are incorrect for this USMLE Exam Prep question. As explained above: Hypotension due to blood loss activates the renin-angiotensin-aldosterone system (RAAS). Angiotensin II, a potent vasoconstrictor produced by the RAAS, directly increases total peripheral resistance …