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.
Types of CDLs. Find out what class of CDL you'll need to drive each type of commercial vehicle. Endorsements and restrictions. There are several endorsements and restrictions for CLPs and CDLs. Find out if you need one. Hazardous materials endorsement (hazmat) Find out how to get your hazmat endorsement and the requirements for transporting hazardous materials.