Question

use the drop - down menus to identify the terms described below.
gland a group of cells that secretes substances into the blood or directly into an organ
hormone a substance produced by cells that helps specific groups of cells to perform specific functions
a channel or tube that conveys a substance
gland
duct
hormone

Explanation:

To solve this, we analyze the description "a channel or tube that conveys a substance". We know:

• A gland secretes substances (not a channel).
• A hormone is a substance (not a channel).
• A duct is defined as a channel/tube that conveys substances (like in exocrine glands, ducts carry secretions). So the correct term is duct.

Answer:

duct