Physiology The dicrotic notch on the aortic pressure curve is caused by A Closure of the mitral valve. B Closure of the tricuspid valve. C Closure of the aortic valve. D Closure of the pulmonary valve. 💡 Explanation The dicrotic notch on the aortic pressure curve is caused by ✓ Correct Answer: C. Closure of the aortic valve.