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.
You must pass a General Knowledge exam. This is required for any type of CDL license. You must pass the Pre-trip inspection. You must pass the Passenger Transport test (if transporting more than 15 people, including the driver). You must pass the HazMat test (if you are transporting hazardous materials).