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.
Age Requirements. You must be at least at 18 to obtain an intrastate CDL and age 21 to obtain a CDL. Identification and Residency Requirements. If you apply for a CDL or commercial learner's permit and DMV records show you have not held a Virginia driver's license or ID card in the past, you must present documents proving your eligibility.