Which component of the conduction system is located between the ventricles? 

Metabolic disorders can be diagnosed using calcium, potassium and alkaline, phosphorus ______ studies.

a. water b. blood c. osteoclasts d. osteoblasts e. none of the above

Acid urine that contains hemoglobin will darken on standing due to the formation of:

A) red blood cells. B) sulfhemoglobin. C) methemoglobin. D) myoglobin.