In the context of the organization of the brain, which part of the hindbrain regulates vital functions such as breathing and heart rate?.

 The medulla oblongata (myelencephalon) is the lower half of the brainstem continuous with the spinal cord.

Explanation: Because, its upper part is continuous with the pons. The medulla contains the cardiac, respiratory, vomiting, and vasomotor centers regulating heart rate, breathing, and blood pressure.