physiological –adj. the science dealing with how living things operate

vary –v. to be different or to become different

physician –n. a medical doctor

anemia –n. medical a condition in which a person has fewer red blood cells than normal and feels very weak and tired

regulate –v. to control how something works

adapt –v. a change to behavior that makes it easier to live or produce something

colleague –n. a person you work with

manipulate –v. to be able to control and change as needed