Answer:
Drop below, inspiration.
Step-by-step explanation:
Respiration may be defined as the process of exchange of gases between the atmosphere, lungs and the body tissue. Two main process that occur during respiration are inspiration and expiration.
Inspiration means the inhalation of oxygen in the alveoli and body tissue. This process depend upon the atmospheric pressure and pressure inside the lungs. The atmospheric pressure is greater than the pulmonary pressure, the oxygen enter in the lungs and result in inspiration. The diaphragm gets contract and pulls sown during inspiration.
Thus, the answer is drop below, inspiration.