your lungs!
The body needs oxygen to live and function appropriately. Without enough oxygen, the brain doesn't work right, the body doesn't heal it's wounds, the heart begins to panic and beat faster, the entire body begins to die.
the immune knows the body well
if a system doesn't work well, the other systems wont too
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
how does the respiratory system work
digestive system
The respiratory system