Based on the diagram below, at which point is the most oxygen being
produced?
oxygen in plants and time of day
oxygen production rate
daun
a. point b
b. point c
c. point d
d. point a

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.