Which of the following is counted as a single respiration?
a. one inhalation
b. one inhalation and one expiration
c. one expiration

B

Explanation:

Respiration is the process of taking in oxygen and expelling carbon dioxide from the lungs

answer; ////increased water pollution; ///////////////////////

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.