What is the primary function of the upper respiratory system? to move air toward the lungs while warming, moistening, and filter
ing it to diffuse oxygen and carbon dioxide in and out of cells to absorb and break down nutrients after they are consumed to pad the head with air pockets to protect against brain trauma
Lifting weights. working with resistance bands. heavy gardening, such as digging and shovelling. climbing stairs. hill walking. cycling. dance. push-ups, sit-ups and squats.
