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Thinking about a negative feedback system, the ______ is the condition being measured and the ______ is the target of the actions of the control center.

The respiratory system plays a major role in homeostasis by regulating

Which organ system is the main system involved in overall homeostasis?

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.