Physiologists are scientists who study how living things work by focusing on one or more of the many functions.

For instance, even when you're just sitting still reading, your body is constantly doing lots of work! You breathe in and out . . . your lungs load oxygen into blood cells . . . your heart pumps blood through your body . . . your brain and muscles keep you from dropping your book and falling out of your chair . . . and on and on.

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