Question

multiple choice question
inspiration occurs as a result of _.
o increased air pressure in the lungs
o decreased air pressure in the lungs
o decreased atmospheric pressure

Explanation:

Inspiration (inhalation) is the process of taking air into the lungs. It occurs when the diaphragm and intercostal muscles contract, increasing the volume of the thoracic cavity. According to Boyle's law ($P_1V_1 = P_2V_2$, where $P$ is pressure and $V$ is volume), when the volume ($V$) of the lungs (part of the thoracic cavity) increases, the pressure ($P$) inside the lungs decreases. When the air pressure in the lungs is less than the atmospheric pressure, air flows into the lungs (inspiration).

Answer:

decreased air pressure in the lungs