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.
The hazmat endorsement allows a driver to drive a CMV carrying hazardous material in placard amounts. Under the US Patriot Act, this endorsement requires the driver to pass a Federal TSA and DOT background check every 5 years in order for it to be applied to a license.