Tetany $(Irregular \text{ muscle contraction})$ and osteoporosis are caused due to the deficiency of

Proper development of the bone depends on

Which of the following are not the effects of Parathyroid hormone $(PTH)$?
$(a)$ Stimulates the process of bone resorption
$(b)$ Decreases $Ca^{2+}$ level in blood
$(c)$ Reabsorption of $Ca^{2+}$ by renal tubules
$(d)$ Decreases the absorption of $Ca^{2+}$ from digested food
$(e)$ Increases metabolism of carbohydrates
Choose the most appropriate answer from the options given below:

What is the function of $PTH$?

The hormone responsible for the regulation of calcium and phosphorus metabolism is secreted by:

$A$ deficiency of which of the following leads to a decrease in blood calcium levels?