The medulla oblongata is the lower portion of the brainstem. It deals with autonomic functions. The cardiac center is the part of the medulla oblongata responsible for controlling the heart rate.
HazMat Endorsement Requirements. Below is what you can expect when applying for a Class H endorsement: You must have a valid commercial drivers license (CDL) for the state in which youâre applying. It must be valid (not currently suspended or revoked) and not checkered with serious road violations.
Please bring the following documents with you when applying for a CDL license. Valid DOT Medical Card PLEASE NOTE: Employees of a government entity must have a current, valid D.O.T. medical card if making application for a CDL with a HazMat (H), Passenger (P) or School Bus (S) endorsement.