Final answer:
The statement is true. Cardio-respiratory endurance is the ability of the body to deliver oxygen effectively during sustained physical activity, and is improved through regular aerobic exercise, which utilizes oxygen more efficiently to support muscle activity and increases the efficiency of the heart and circulatory system.
Step-by-step explanation:
True or false: Cardio-respiratory endurance is the body's ability to deliver oxygen effectively to the working muscles so that an individual can perform physical activity. This statement is true. Cardio-respiratory endurance is a critical component of overall fitness and describes the ability of the heart, lungs, and blood vessels to supply oxygen to working muscles during sustained physical activity, such as aerobic exercise.
Aerobic exercise includes activities like cycling, running, and swimming, which can be maintained over extended periods and primarily use slow-twitch muscle fibers. These fibers are rich in capillaries, mitochondria, and myoglobin, enabling them to better support sustained aerobic activity through efficient oxygen use. Regular aerobic exercise enhances this endurance and improves the efficiency of the circulatory system and the heart, which is known for its high amount of mitochondria that help in resisting fatigue.
It is also noteworthy that genetic differences may lead to varying levels of improvement in cardio-respiratory endurance due to the proportions of slow-twitch and fast-twitch muscle fibers in individuals. However, with consistent aerobic training, most people will experience improvements in endurance, allowing for less frequent muscle fatigue and more effective aerobic performance.