Regular exercise only impacts the muscular system of the body.

The classification system is always evolving as scientists continuously question the organization and placement of organisms.

The _____ are paired organs found inside the pleural cavities. 

The ______. _______ is where gas exchange occurs and contains the lungs and all of their components. 

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

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

The top chambers of the heart that receive blood coming into the heart are called _____.

The thick middle muscular layer of the heart wall is the _______.

_______ is another name for high blood pressure. 

The bottom chambers of the heart whose job it is to pump blood out of the heart are called _____.