Which of the following hormones was discovered by James Bertram Collip?

The blood calcium level is lowered by the deficiency of

Which of the following causes an increase in blood calcium levels?

Calcium level decreases in the blood due to hyposecretion of

$A$ person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly?

Parathormone deficiency produces muscle cramps or tetany as a result of: