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.
There are medical requirements and residency requirements besides knowledge and skills requirements. The first step is to get a copy of your state's Commercial Driverâs Licensing (CDL) Manual. The manual is available in their field locations, downloaded from their website and printed. Each state has its own processes to getting the CDL.