What happens to the circulatory system during exercise?

Science

Which part of the circulatory system pushes blood to all parts of the body?

Which part of the circulatory system carries blood around your body from the tip of your toes to the top of your head?

Which part of the circulatory system carries important substances like oxygen and nutrients to the muscles?

What substance is produced in the muscles during exercise?

Choose the word that finishes the sentence. "When a muscle contracts it gets..."

Choose the word that finishes the sentence. "When a muscle relaxes it gets..."

Choose the word that finishes the sentence. "When one muscle relaxes the other..."