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.
Drivers renewing or transferring an âHâ or âXâ endorsement on or after May 31, 2005, may receive a 90-day CDL with the HazMat endorsement that will allow them to haul hazardous materials while the required assessment is being completed (or verified, if the assessment was completed in the driver's previous state of residence).