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.
This process is a bit of a pain, but it's really not that big of a deal. It just goes with the territory. But the rest of the endorsements simply require passing a written test. They do not require re-testing, background checks, or any sort of driving test. Which CDL Endorsements Will I Want To Get? The question of which CDL endorsements you should get is incredibly simple - all of them. Why? Because every endorsement is an opportunity at a whole subset of truck driving jobs (or bus driving for that matter). Other than HAZMAT , all of the endorsements are fast, simple, and inexpensive to get. You take a simple written test, pay a few bucks for it (Like $20 or something like that), and you're done.