Question

which structure can secrete a substance into the environment surrounding the body? lacrimal gland adrenal gland pancreas pituitary gland

Explanation:

To solve this, we analyze each gland:

• Lacrimal gland: Secretes tears onto the surface of the eye (external environment).
• Adrenal gland: Secretes hormones (e.g., adrenaline) into the bloodstream (internal environment).
• Pancreas: Secretes hormones (e.g., insulin) into the blood and digestive enzymes into the small intestine (mostly internal, with enzymes entering a body cavity, not the external environment).
• Pituitary gland: Secretes hormones into the blood (internal environment).

Only the lacrimal gland secretes a substance (tears) into the environment surrounding the body.

Answer:

A. lacrimal gland