Two pistons push down on the fluid filling two cylinders connected by a narrow hose,as shown in the figure.The area A1 is 1 square inch,and the area A2 is 10 square inches.A force of 4 pounds is exerted downward on piston 1,as shown. 
-The pressure on A2 is 40 psi.
Definitions:
Tertiary Bronchi
The third level of branching airways in the lungs, extending from the secondary bronchi to the bronchioles.
Passage
A section of text or a pathway through which something moves from one place to another.
Pharynx
The part of the throat behind the mouth and nasal cavity, leading to the esophagus and larynx, involved in breathing and swallowing.
Upper Respiratory Tract Infection
An infection in the upper part of the respiratory system, such as the throat, nose, and bronchi, often caused by viruses or bacteria.
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