Crystal. When most people talk about bringing out the crystal, they are often referring to a type of glass that is made from silica, lead oxide, soda or potash, and other additives. Lead crystal is prized for its durability and decorative properties, even if it does not necessarily possess a crystalline structure.
What part of the brain controls breathing and heartbeat? The brain stem controls breathing and heart rate as well as blood pressure and alertness. Found at the top of the spinal column, the brain stem consists of three main parts, including the medulla oblongata, pons and midbrain. The medulla oblongata controls cardiac and respiratory rates.
BRAIN STEM CONTROL OF BREATHING. Breathing is an involuntary process that is controlled by the medulla and pons of the brain stem. The frequency of normal, involuntary breathing is controlled by three groups of neurons or brain stem centers: the medullary respiratory center, the apneustic center, and the pneumotaxic center. Medullary Respiratory Center.