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As person ages, their target heart rate

_______ fluid surrounds the cells that make up tissues in the body.

______ are microscopic air sacs that fill the interior of the lungs; this is where the actual exchange of gas occurs with the blood. 

The ______ is the opening into the larynx. 

The ______. ________ is a double layered sac-like structure that surrounds each lung; produces lubrication to reduce lung friction during breathing. 

_______ _______ are similar in structure and function to tonsils and are found in the wall of the small intestines. 

______ is the fluid derived from interstitial fluid. It contains proteins and other important constituents that have been lost by the blood. It is transported by the lymph vessels.

Component of blood that is mostly water and proteins is _______.

The outermost layer of the heart wall is the _________.

The force exerted on a vessel by the blood inside of it is called ______ ______.