Which of these correctly ranks the normal pressure values in the atmosphere (atm), alveoli (alv), and intrapleural space (ip) when a person is resting at functional residual capacity (frc)?
patm = palv> pip
patm> palv> pip
patm < palv < pip
patm = palv = pip
patm = palv < píp

Correct answer is A

Explanation

This is because whenever the alveolar is at rest, it's pressure = 0 since it is measured in relation to the atmospheric P , therefore,  Patm =  Palv

However, When the intrapleural P at rest, it's pressure Pip < 0 i.e Negative

because of the competing forces on the intrapleural cavity

Patm= Palv>pip

Explanation:

The functional residual capacity is the volume of air that is in the lungs after an expiration. After an expiration there is still air in our lungs but as the atmosphere pressure (Patm) and the alveoli pressure (Palv) are balanced no air goes in or out, in order to expulse more air a forced expiration is needed where the Palv increases and  the Patm decreases. The pressure in the intrapleural space (Pip) is always negative, it will be higher than the alveoli pressure if there is a problem such as water or air in the intrapleural space.

maybe because its impossible for balloons to lift a whole entire house.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.