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.
CDL Hazmat Basics Eligibility. You can apply for a commercial driver's license from your state's motor vehicle department when you are 18 years old. However, federal law prohibits you from driving a commercial vehicle across state lines until you are at least 21 years old. You also need a special endorsement to your CDL to transport hazardous material. Federal law prohibits you from applying for the hazmat endorsement until you are 21 years old. Whenever you apply for or renew a CDL, federal law also requires that you disclose all licenses previously issued to you, regardless of type or state, for the past 10 years.