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
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pituitary gland
thyroid gland
Use the drop-down menus below to complete the following statement. The system contains glands that secrete hormones into the bloodstream, whereas the system secretes substances through ducts.
salivary glands
Which endocrine gland is indicated by the arrow?
Which endocrine gland is indicated by the arrow?
Use the drop-down menus to determine which structures of the endocrine system are described below. connects the endocrine system to the nervous system called the “master gland” of the endocrine system secretes a hormone that regulates sleep cycles regulates the development and differentiation of T lymphocytes
called the “master gland” of the endocrine system
secretes a hormone that regulates sleep cycles
regulates the development and differentiation of T lymphocytes
Which exocrine gland is indicated by the arrow?
Use the drop-down menus to determine which structures of the exocrine system are described below. secrete mucus that protect organs secretes enzymes that aid in digestion secrete tears keep the skin hydrated and soft
secretes enzymes that aid in digestion
secrete tears
keep the skin hydrated and soft
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