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.
What are the extra costs? While most of the material will be found in the hazmat section of your CDL handbook, some drivers opt to purchase additional study materials. These materials and hazmat study tests can cost anywhere from $10 to $50, depending on the company. Renewal fees will apply in the future. Keep in mind that to operate other special types of commercial vehicles may require other common endorsements such as the H, N or X endorsement.