What is a key adaptation of the cardiovascular system from regular exercise?

The cardiovascular system undergoes several significant adaptations as a result of regular exercise, one of which is the enhanced efficiency of oxygen transport. This adaptation is particularly important because it improves the body's ability to deliver oxygen to working muscles during physical activity.

With regular exercise, the heart becomes stronger and more efficient at pumping blood. This means that it can pump a larger volume of blood with each heartbeat, known as stroke volume. As a result, the body is better equipped to transport oxygen from the lungs to the muscles, which is crucial for aerobic activities. Additionally, regular exercise can lead to an increase in the number of red blood cells and capillaries, further enhancing the ability to transport oxygen efficiently.

This adaptation not only supports better endurance but also overall cardiovascular health, which can reduce the risk of heart disease and other related conditions. Being able to effectively manage oxygen levels during exercise allows individuals to perform better and recover faster.

Other options suggest changes that are either inaccurate or unrelated to the primary adaptations seen in the cardiovascular system. For example, while muscle mass may increase through resistance training, it is not a primary cardiovascular adaptation. Similarly, decreased lung capacity contradicts the training response, as lung capacity typically improves or remains stable with regular aerobic activity. Lastly, improvements in