Question

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

Explanation:

Addison's disease is an endocrine disorder. It occurs due to insufficient production (hyposecretion) of hormones by the adrenal cortex. Hypersecretion of the adrenal cortex would lead to different conditions (like Cushing's syndrome). Hyposecretion of the thyroid gland causes hypothyroidism - related issues (like myxedema in adults, cretinism in infants). Hypersecretion of the thyroid gland causes hyperthyroidism (like Graves' disease). So, Addison's disease is specifically related to adrenal cortex hyposecretion.

Answer:

B. hyposecretion of the adrenal cortex.