A gerontologist studies the physical, cognitive, social, emotional, psychological, and societal effects of the aging process on the human body. Gerontologists are health care professionals who specialize in working with elderly patients. They provide their services to people in nursing homes, senior citizen centers, and other similar facilities.

Medical assistants perform administrative and certain clinical duties under the direction of a physician. Duties may include scheduling appointments, maintaining medical records, and billing and coding information for insurance purposes. Clinical duties may include taking and recording vital signs and medical histories, preparing patients for examinations and drawing blood.

Physician assistants provide health care services under a physician’s supervision. They perform tasks that are usually performed by doctors. They conduct physical exams and provide treatment, and counsel patients. Physician assistants may prescribe medications.