During strenuous exercise, the human body's muscular system requires increased oxygen and nutrients. Which two body systems primarily coordinate to meet these increased demands?

The correct answer to the question "During strenuous exercise, the human body's muscular system requires increased oxygen and nutrients. Which two body systems primarily coordinate to meet these increased demands?" is Option C: Respiratory and Circulatory.

The other options — A) Endocrine and Immune, B) Digestive and Skeletal, D) Nervous and Lymphatic — are incorrect for this GED Exam Prep question. As explained above: The respiratory system takes in oxygen and expels carbon dioxide, while the circulatory system transports oxygen, nutrients, and waste products throughout the body. During exercise, these two systems…