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.
Haz mat cdl is only good for 4 yrs. before retest on Haz mat. All other licenses are good for up to 8 yrs. Every state has its own renewal requirements,but federal law requires that you take a physical every 2 years,also hazmat needs to retest every 2 years.