Blood pressure peaks right after ventricular contraction

Steps:

• Blood pressure is generated by the heart's pumping action during systole.
• The left ventricle ejects blood into the aorta at maximum force.
• Pressure drops progressively through arteries, capillaries, and veins due to resistance and vessel expansion.
• Highest pressure occurs immediately after leaving the left ventricle.

Why A is correct:

• Point A is in the aorta, where systolic pressure reaches 120 mmHg as defined by cardiac output and arterial elasticity.

Why the others are wrong:

• B (arteries): Pressure lower due to friction and branching.
• C (capillaries): Minimal pressure from high resistance and thin walls.
• D (veins): Lowest pressure as blood returns passively to heart.

Final answer: A