HELP M 1. What happened to your breath rate and heart rate as you exercised? *

2. Why do you think the respiratory system took in more oxygen when you were running? *

3. Why do you think the circulatory system was pumping blood faster when you were running? *

1.The two systems are correlated so they both increased.

2.Oxygen is required for cellular respiration and this is needed to make energy for yourself.

3. Because your body (Muscles to be more specific,) requires that to function at the increased stress.

i think the answer is g1

hope i

-lavira: )