Question

what is the correct definition of cardiorespiratory endurance? the ability to maintain stable levels of oxygen and blood flow during an extended period of physical activity the ability of the bodys circulatory and respiratory systems to supply fuel and oxygen during sustained physical activity the ability to maintain a sufficient level of oxygen over an extended period of physical activity the ability of the heart and the lungs to function at an acceptable level during an extended period of vigorous physical activity

Explanation:

Cardiorespiratory endurance specifically refers to the combined function of the circulatory (heart - blood vessels) and respiratory (lungs - airways) systems. It is about their ability to supply fuel (like glucose) and oxygen to the working muscles during sustained physical activity. The first option only mentions oxygen and blood flow stability, which is too narrow. The third option only focuses on oxygen level maintenance. The fourth option emphasizes the heart and lungs' function at an acceptable level, but cardiorespiratory endurance is more about the supply of fuel and oxygen during activity rather than just the function level of heart and lungs. The second option correctly highlights the circulatory and respiratory systems' role in supplying fuel and oxygen during sustained physical activity.

Answer:

the ability of the body’s circulatory and respiratory systems to supply fuel and oxygen during sustained physical activity