What does parathyroid hormone convert?

Answer 1

parathyroid harmone;secreated by parathyroid glands.these are present on thyriod gland.and these are four in number.placed 2 in one part of thyroid gland and 2 in another part of thyroid gland.

its secreations;secreats paratharmone.

antoginstic to;it is acts antagonistic to calcitonin secreated by parafollicular cells or 'c' shaped cells present in thyroid gland.

1. its functions;its main role is to regulate calcium levels in blood.it helps in decresing calcium levels in blood.while calcitonin helps in maitained ionised calcium levels in blood.
2. it mainly acts on bones,smallintestine and renal tubules present in kidneys.
3. action on bones;it causes bone reabsorption or demineralisation of bone.that means it absorbs calcium from bones .it acts on bones through osteoclasts.while absorbing calcium from bones there will be loss of mucopolysaccharide from bone matrix.
4. action on smallintestine;it stimulates absorption of calcium in smallintestine.but ca and P occurs only in presence of vit-D presence.in deficiency of this vitamin ricketsoccurs.it ledas to osteoporosis.
5. action on renaltubules;stimulates reabsorption of Ca from glomerular filterate.
6. excreation;this harmone also helps in excreating in Ca and P in urine.

disorders;hyposecreation;causes low Ca levels in blood as a result muscular weakness occurs ,tetany also occurs.

hypersecreation;this causes decalcification of bones,and calcium starts get depositing in form of caliculi,in kidneys,pancreas.calcification also occurs in soft tissues even in pericardium.bones becomes weak due to excess demineralisation.