The chief cells of the parathyroids secrete parathormone. Its deficiency causes the lowering of blood calcium level. This increases the excitability of nerves and muscles causing cramps and convulsions. This caused parathyroid tetany characterised by sustained contractions of the muscles of larynx, face, hands and feet. Calcitonin is secreted when calcium level is high in blood. It has an opposite action to that of parathyroid hormone and lowers the calcium level by suppressing release of calcium ions from the bones. Thyroxine is secreted from the thyroid gland. It regulates the metabolic rate of the body and thus, maintain basal metobolic rate, stimulate protein synthesis and therefore, promote growth of the body tissues.
The blood calcium level is lowered by the deficiency of
NEET UG 2008 — Zoology Chemical Coordination and Integration
2008mcqeasy
The blood calcium level is lowered by the deficiency of
Official previous-year question
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
parathormone
- B
thyroxine
- C
calcitonin
- D
Both (a) and (c)
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