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.
Once you possess a Class A, B, or C CDL, you may begin the application process for a hazardous materials (HAZMAT) endorsement. While the process may differ slightly according to your state, below is an example of the basic steps: