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.
Commercial Driverâs License. Applicants must apply for a CDL at a state driver exam station. Required documents include: Completed license application form; Other required documents and a completed medical certificate form (if applicable) Two documents in your name to prove your residential/physical address.