(a) A license issued to a physician assistant by the appropriate state licensing board shall authorize the physician assistant to perform medical acts:
(1) Delegated to the physician assistant as part of an authorized practice agreement;
(2) Appropriate to the education, training and experience of the physician assistant;
(3) Customary to the practice of the supervising physician; and
(4) Consistent with the laws of this state and rules of the boards.
(b) This article does not authorize a physician assistant to perform any specific function or duty delegated by this code to those persons licensed as chiropractors, dentists, dental hygienists, optometrists or pharmacists, or certified as nurse anesthetists.