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.
If your CDL has a Hazardous Materials Endorsement (H) or a combined Tank/Hazardous Materials Endorsement (X) you will be required to successfully complete a new TSA security threat assessment and pass the Hazardous Materials Endorsement (H) test each time you renew your CDL.f your CDL has a Hazardous Materials Endorsement (H) or a combined Tank/Hazardous Materials Endorsement (X) you will be required to successfully complete a new TSA security threat assessment and pass the Hazardous Materials Endorsement (H) test each time you renew your CDL.