Use the drop-down menus to identify the terms described below. a group of cells that secretes substances into the blood or directly into an organ a substance produced by cells that helps specific groups of cells to perform specific functions a channel or tube that conveys a substance
Use the drop-down menus to determine which system the following structures belong to.
Use the drop-down menus to determine which system the following structures belong to. pituitary gland thyroid gland salivary glands
✔ thymusthyroid glandadrenal glandhypothalamus regulates the development and differentiation of T lymphocytes
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