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

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:

Statement $P$: The hormones of the parathyroid gland are steroid in nature.
Statement $Q$: Muscles contain globular proteins.

Deformity in bones is caused due to the deficiency of which of the following?

Parathormone $(PTH)$ regulates which of the following?

Calcium level decreases in the blood due to hyposecretion of