Angiogenesis is the new blood vessels formation. After strenuous exercise, local [X] would be least similar to post-exercise [Z] in subjects in group A.
<h3>What is the impact of exercise?</h3>
After any exercise, a person's body repairs or replaces muscle fibers damaged during the exercise by fusing muscle fibers together to form new muscle protein strands called myofibrils.
These replaced myofibrils increase in thickness and number to form muscle hypertrophy. These larger muscles require more blood vessels.
If cytokine X acts to promote angiogenesis in the new muscle tissue, it will mean a person would expect large increases in the local concentration of X.
Thus the group that is least similar to this large increase in local [X] would be the group with the less increase in [Z] which is group A.
Thus, the correct option is for subjects in group A.
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