assessment.
1. The primary function of the _________________ is to supply the blood with oxygen so that the blood can deliver oxygen to all parts of the body. (1 point)
Digestive system
Cardiac system
Respiratory system
Endocrine system
2. The ___________ is a strong wall of muscle that contracts to create a suction in the chest to draw in air and expand the lungs. When the muscle relaxes, the chest cavity decreases and the air is pushed out. (1 point)

Question

assessment.
1.   The primary function of the _________________ is to supply the blood with oxygen so that the blood can deliver oxygen to all parts of the body.  (1 point)
Digestive system
Cardiac system
Respiratory system
Endocrine system
2.   The ___________ is a strong wall of muscle that contracts to create a suction in the chest to draw in air and expand the lungs. When the muscle relaxes, the chest cavity decreases and the air is pushed out.  (1 point)

anonymous · Answer

You may want to go to science. 

but 1 is respiratory system- breathing, oxygen...
 2 is the diaphragm