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 Learner Permit - Additional Requirements. 1  You must be at least 18 years of age (21 for operations that require a medical card) 2  You must possess a valid Classified A, B, or C Driver License.  Will be accompanied by a licensed CDL operator, with the proper class of license, in the front seat beside you.