As the iris contracts and relaxes, an opening at its center, the ________, grows larger or smaller.

A type of Medicaid managed care plan can involve a health maintenance organization that contracts with Medicaid and is paid a monthly fee for each enrolled beneficiary; this payment arrangement is known as ________.

Fill in the blank(s) with the appropriate word(s).

Which of the following conditions would be LEAST likely to cause an alteration in behavior?

A. Brain injury B. Hypertension C. Hypoxemia D. Hypoglycemia