Homeostasis is the
a) cooperation of body parts to form tissues, organs, and systems
b) correlation of structure and function
c) idea that all vertebrates are built in a similar way
d) maintenance of a relatively constant and optimal internal environment
e) exchange of materials with the surrounding environment

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes