it works by the brain,heart,and spinal cord.
The digestive system does not work with the immune system to regulate body functions.
The digestive system does not work with the immune system to regulate body functions.
The digestive system does not work with the immune system to regulate body functions.
The digestive system does not work with the immune system to regulate body functions.
The digestive system does not work with the immune system to regulate body functions.
how does the respiratory system work
digestive system
how does the respiratory system work
The respiratory system
*
your lungs!
circulatory system