1) Since lung tissue is elastic and tends to decrease its volume; there is always a negative intrapleural pressure of approximately 5 cm H₂O. Assuming the alveolus with a radius of 0.2 mm. What is the surface tension require to prevent alveolar collapse in the baby? 2) As the baby starts normal respiration, the volume of the alveolus changes between (100-40%) fully-filled to partially-filled. Plot how the changes in alveolus volume would affect the surface tension. 3) Is there any chance of alveolus collapse at higher tidal volumes? Why?

A marine biologist is preparing a deep-sea submersible for a dive. The sub stores breathing aid under high pressure in a spherical tank that measures 84.0cm wide. The biologist estimates she will need 3200. L of aid for the five. Calculate the pressure to which this volume of air must be compressed in order to fit into the air tank. Round your answer to 3 sig figs and write your answer in atmospheres.

A typical resting tidal volume would be expected to be around: O 1200 mL O 6000 mL 3000 mL Ⓒ 500 mL

Answer question in attached image