7. How does your respiratory and circulatory systems attempt to maintain homeostasis
 during exercise?
 a. Your body produces more red blood cells to help provide energy to cells.
 b. Your lungs produce more oxygen which is then delivered to the cells through the
 blood.
 c. You experience an increase in blood flow which provides nutrients to cells to
 increase energy and remove wastes.
 d. You experience an increase in breathing rate to obtain more oxygen which is
 delivered to cells through the bloodstream.