d) What are the various age-related changes in cardiovascular system?

As people age, their cardiovascular system undergoes a variety of changes that can increase the risk of cardiovascular disease and other health issues. Some of the key age-related changes in the cardiovascular system include:

1. Structural changes: With age, the walls of the heart become thicker and stiffer, which can reduce the heart's ability to pump blood effectively. Additionally, the heart may enlarge slightly, and the heart valves may become thicker and less flexible, which can reduce their ability to open and close properly.

2. Decline in heart rate variability: As people age, their heart rate variability (HRV) tends to decrease. HRV is a measure of the variation in time between successive heartbeats, and reduced HRV is associated with an increased risk of cardiovascular disease and other health issues.

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