Describe the path taken by an oxygen molecule as it moves from the atmosphere to the muscles.
The fitness training is intended to bring about changes in the man's body. Suggest two body changes that would improve his ability to supply oxygen to his muscles.
State the chemical process in muscles that uses oxygen to release energy.
Use the graph to find the maximum volume of oxygen the man uses in one minute.
The graph indicates that the man can push his exercise intensity beyond the point where maximum oxygen consumption has been reached, but only for a short time. Explain why.
After four weeks of fitness training, the man measures his oxygen consumption again. On the graph, sketch a line to show the expected results of successful fitness training.