| At the present time the tendency among some writers is to make the ductless glands the responsible agents in almost all diseases. |
| A ductless recirculating fume hood is a safety device used to protect laboratory workers when handling chemicals that pose an inhalation risk. |
| They also possess ductless endocrine glands that play a critical role in regulating the body metabolism. |
| In recent years the glandular system, and especially that of the ductless glands, has taken on an altogether new significance. |
| The activities of the ductless glands and their hormones equally serve both ends in ways that cannot be distinguished. |
| Endocrine glands by contrast are ductless, and secrete hormones directly into the bloodstream. |
