A Healthy 80-Year-Old Man Has Participated in a Longitudinal Study

A healthy 80-year-old man has participated in a longitudinal study over the past 30 years to study the effects of aging on overall cardiovascular status.  He has undergone annual testing with echocardiography and his left ventricular ejection fraction has remained stable throughout the 30 years.  Which of the following changes is most likely responsible for the preserved left ventricular ejection fraction in this patient?

A) Cardiomyocyte hypertrophy
B) Increased arterial reserve capacity
C) Increased left ventricular compliance
D) Increased left ventricular diastolic volume
E) Stable ventricular myocyte number

Correct Answer:

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