Calcium is a metallic element with an atomic number of 20. It has a silver-white color and melting point of 838.8°C. 99% of calcium in the human body is found in bones and teeth, where it forms the biominerals necessary for structural integrity. Calcium plays important roles in muscle contraction, blood clotting, gluconeogenesis, and acting as a messenger for hormonal activation through the parathyroid hormone and calcitonin systems. Deficiencies can lead to diseases like rickets and osteoporosis, while too much calcium can cause hypercalcemia.

1. Presentedby
Sadhana H S
I B.Ed

2. Introduction
 Calcium is a silver white metallic element
of the alkaline earth metal.
 Element - calcium
 Symbol - Ca
 Atomic mass - 40.078
 Atomic number - 20
 Boiling point - 1.4840
C
 Melting point - 838.80C
 Electronic configuration – 1s2 2s2 2p6 3s2
3p6 4s2
 99% of calcium in the human body is in
bone and teeth the remaining 1% in blood.

3.  Calcium is a major components of the structural
materials like bone and shell.
 Formation of skeleton occurs through the
biomineralisation of calcium ion.
 In such structural units calcium forms the
biominerals like insoluble carbonate

4. Seashells Bone
Egg shells Dental caries

5. USES OF CALCIUM
 Muscle contraction –Glycolysis – metabolic
degradation of glucose.
 Gluconeogenesis – metabolic synthesis of
glucose.
 Blood clotting – whenever our skin becomes
broken, calcium works together with vitamin
K and protein will helps to blood clotting.
 Messenger system for hormonal activation
1 Parathyroid hormone
2 Calcitonin

6. Diseases
 Rickets (defective
calcification):
 Osteporosis
(demineralisation of
bone)
 Hypercalcaemia
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