MULTIPLE ROLES OF INTRACELLULAR CALCIUM  IONS
PIP2
  Ca   /CALMODULIN 
 
PLC
VOLTAGE-SENSITIVE
CALCIUM CHANNEL
LIGAND-GATED
 CALCIUM CHANNEL
MYOSIN LIGHT
CHAIN KINASE
(MLCK)
PI-LINKED
RECEPTOR
G PROTEIN
CAM  KINASE 3
IP3
2+  
PHOSPHORYLASE
KINASE
MULTIFUNCTIONAL
CAM  KINASES
MYOSIN LIGHT
CHAIN
PHOSPHORYLASE
EUKARYOTIC
ELONGATION FACTOR II
CALCIUM IS �STORED�
IN THE ENDOPLASMIC
RETICULUM
Ca2+
Ca2+