1. 
   SA node
   SA node: The SA node (SA stands for sinoatrial) is one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contrac...
   Found op http://www.medterms.com/script/main/art.html?articlekey=5402
   
   
2. 
   SA node
   sinoatrial node.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   Sacrifical Anode
   An easily corroded material deliberately installed in a pipe or intake to give it up (sacrifice it) to corrosion while the rest of the water supply facility remains relatively corrosion-free.
   Found op http://www.epa.gov/OCEPAterms/
   
   
4. 
   Sacrificial Anode
   A piece of metal buried near a structure that is to be protected from corrosion. The metal of the sacrificial anode is intended to corrode and reduce the corrosion of the protected structure.
   Found op http://www.encyclo.co.uk/local/21690
   
   
5. 
   Sacrificial Anode
   A metal rod placed in a water heater tank to protect the tank from corrosion. Anodes of aluminum, magnesium, or zinc are the more frequently metals. The anode creates a galvanic cell in which magnesium or zinc will be corroded more quickly than the metal of the tank giving the tank a negative charge...
   Found op http://www.electromn.com/glossary/s.htm
   
   
6. 
   sacrificial anode
   Water tank with sacrificial anode An anode (positive electrode) that is attached to a metal object to protect the object from corrosion. In the case of a water heater tank, a sacrificial anode takes the form of a metal rod that is placed in the tank. Anodes of aluminum, magnesium, or zinc...
   Found op http://www.daviddarling.info/encyclopedia/S/AE_sacrificial_anode.html
   
   

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