Question

which structure secretes hormones directly into the bloodstream without using a duct?
lacrimal gland
adrenal gland
oil gland
salivary gland

Explanation:

Endocrine glands secrete hormones directly into the bloodstream without ducts. The adrenal gland is an endocrine gland. Lacrimal, oil, and salivary glands are exocrine (use ducts to secrete substances like tears, oil, saliva).

Answer:

B. adrenal gland