Circulatory system pumps blood from the heart to the lungs to get oxygen. The heart then sends oxygenated blood through arteries to the rest of the body. The veins carry oxygen-poor blood back to the heart to start the circulation process over. Your circulatory system is critical to healthy organs, muscles and tissues.
It is called a nucleus. It's what determines what type of metal, gas, or whatever on the table.
You should wear safety goggles, make sure that your equipment is clean, and use the proper amount of chemicals(or other substance) as told
