Examples of calcium

• A surplus of calcium brings on senility, as noted above. 

• Besides these four elements, living organisms commonly contain sulphur, phosphorus, chlorine, potassium, sodium, calcium, magnesium and iron. 

• Calcium and chlorine are rarer than on earth, sodium is somewhat commoner. 

• Lime also adds another plant food called calcium. 

• Normal blood albumen is essentially a compound of calcium and sodium into which iron and sulphur both enter. 

• Redundant mechanisms of calcium-induced calcium release underlying calcium waves during fertilization of sea urchin eggs.

• In the present work we wanted to verify whether oocytes recovered from preantral follicles were able to acquire calcium activity during follicle culture.

• It is uncertain, however, how a high concentration of calcium in the absence of lactate inhibits capacitation.