AP BIOLOGY

Detailed explanation-1: -The system that responds by delivering more oxygen to these cells is the circulatory system. The circulatory system, often referred to as the cardiovascular system, allows blood to circulate throughout the body to transport important nutrients to the body.

Detailed explanation-2: -Running is an activity that causes the cells in the muscular system to use oxygen at a faster rate.

Detailed explanation-3: -The circulatory system delivers oxygen and nutrients to cells and takes away wastes. The heart pumps oxygenated and deoxygenated blood on different sides. The types of blood vessels include arteries, capillaries and veins.

Detailed explanation-4: -Cardiovascular endurance is the ability of the heart, lungs and blood vessels to deliver oxygen to working muscles and tissues, as well as the ability of those muscles and tissues to utilize that oxygen over an extended period of time with moderate intensity.

Detailed explanation-5: -Cardiorespiratory endurance is the ability of the heart, blood, blood vessels and lungs to supply enough oxygen and necessary fuel to the muscles during long periods of physical activity.