Question

graves disease is caused by:
a hypersecretion of the thyroid.
b hyposecretion of the thyroid.
c hypersecretion of the adrenal cortex.
d hyposecretion of the adrenal cortex.

Explanation:

Graves' disease is an autoimmune disorder. In this condition, the immune system mistakenly attacks the thyroid gland. This leads to the thyroid gland over - producing thyroid hormones. Hypersecretion means excessive secretion. Hyposecretion of the thyroid (B) would lead to a condition like hypothyroidism. Hypersecretion or hyposecretion of the adrenal cortex (C and D) is related to disorders like Cushing's syndrome (hypersecretion of adrenal cortex) or Addison's disease (hyposecretion of adrenal cortex), not Graves' disease.

Answer:

A. hypersecretion of the thyroid.