What is the correct definition of the term muscle endurance?
a. the ability of a muscle to repeatedly exert a force over a prolonged period of time.
b. the measure of how effectively your heart and lungs work during physical activity or exercise.
c. the ability to handle the physical work and play of everyday life without becoming tired.
d. the ability to move joints fully and easily.

A. The ability of a muscle to repeatedly exert a force over a prolonged period of time. 

1.controls blood flow2.controls oxygen flow3.carries oxygen rich blood to veins

Afew buddies come over to your house to hang out. they notice you're struggling in school, perhaps you have to rely on to pass your class, but you can't absorb the knowledge. they could positively reinforce getting a tutor and working with you, dedicating more time to the areas of struggle and less on hanging out to better yourself.secondly, say you're the victim of bullying. you're afraid to tell an adult because of possible repercussions from the bully himself. your friends encouraging you and pushing you towards telling an adult for your safety is another example.