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.
These 10 facts about space will blow your mind. The respiratory center consists of areas of the brain that are responsible for automatic control of breathing. Nerve cells in part of the lower brain stem, known as the medulla oblongata, initiate and set the rhythm of respiration. Another area of the brain stem, called the pons, contains nerve cells that affect the breathing rate. Nerve impulses travel from these areas to the respiratory muscles, causing inspiration and expiration.