Asthma narrows airways to the lungs and in the lungs by contraction of muscles around the air passages, swelling of the airway l
ining, and build-up of excessive mucus. Because of this, asthma makes both the ___________ and ______________ systems work harder to deliver oxygen to the cells throughout the body. A) respiratory; nervous
B) respiratory; muscular
Reactivate
C) respiratory; digestive
D) respiratory; circulatory
