Who am I? Fluid and electrolytes

I.....
have normal serum level of 3.5-5.0mEq/L
am no conserved
am needed for muscle contraction
am a major cation of the ICF
am instrumental in muscle, nerve impulse transmission
have a reciprocal action to Na+
am excreted primarily by the kidneys

I.....
am the main ECF anion
am found in GI fluid, blood, interstitial fluid and lymph
have a normal serum level of 95-105mEq/L
pair up with Na+
am excreted or conserved by the kidney
am down, so is K+ and when i am up so is K+
help to maintain osmotic pressure

I....
am the main electrolyte in water
have normal serum level of 135-145mEq/L
mainly regulated reasbsorption or excretion through the kidneys but may be lost through the skin and GI tract
am important to the fuctioning of nervous and muscle tissues
am a risk for alterations from my normal levels anytime fluid volumes change
assist with fluid regulation. In fact I am the primary regulator of ECF

I...
am excreted in urine, feces, bile, digestive secretions.
am found mainly in teeth and bones
play a major role in muscle, neuromuscular and cardiac function
am stimulated by vitamin D
am low in the presence of high serum phosphate levels
have a normal serum level of 9mg/dl-11mg/dl
am part of the intrinsic pathway and blood coagulation
am reciprocal with phosphorus

I...
have a normal serum value of 1.2mEq/L-3mEg/l
am important in acid base balance, metabolism, ATP, and hereditary traits
am at risk of depletion when people are malnourished
have an inverse relationship with calcium

I....
am present in heart, bone, nerve, muscle tissue
maintain normal intercellular levels of K+
have a normal serum level of 1.5mEq/L-2.5mEq/L
am absorbed in the intestines and excreted by the kidneys
am important in cardiac and muscle functioning