Research the causes of these diseases that are similar to, or related to, Autoimmune Urticaria: 1  Idiopathic urticaria without angioedema. 2  Chronic urticaria.  Occult infection (e.g., sinusitis, oral infection, cholecystitis, vaginitis, prostatitis, hepatitis, HIV, tinea manus or pedis)
The sarcoplasmic reticulum is known for its storage of calcium ions in muscle cells.
Intracellular calcium concentrations in both cardiac and vascular smooth muscle cells range from 10 -7 to 10 -5 M. Extracellular concentration of calcium is about 2 Ã 10 -3 M (2 mM).