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Atoms are made up of particles called protons, neutrons, and electrons, which are ... Within the main group elements ( Groups 1-2, 13-18), there are some general ... (via loss of electrons), the ion is positively charged and is called a cation.
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Nerve cells, Blood cells, Reproductive cells, Skin cells
 
        
             
        
        
        
The sequence of impulse through the cardiac conduction system starts from SA node passes to AV node to atrioventricular bundle fibers and finally to Purkinje fibers. 
Heart is an organ that receives oxygenated blood form lungs and deoxygenated blood from different parts of body. Oxygenated blood is transported to different organs and deoxygenated blood is transported to lungs for oxygenation.
Now, to perform this transportation, the auricles and ventricles of heart contract and relax. In order to contract and relax, impulse generation is required, which begins at SA node or Sinoatrial node. It is also referred to as pacemaker of the heart. SA node contracts the atria and the impulse transfers to AV node or Atrioventricular node. 
This is followed by transfer of impulse to atrioventricular bundle fibers which further passes it on to Purkinje fibres for ventricular contraction. Now the blood is sent to lungs and aorta as per it's oxygen status. 
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Yes it can. It can cause an overdose and can cause a seziure/stroke and you can die. Half the bottle and pretty much any mg per tablet honestly. Hope this helps :)
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