NEETZoologyChemical Coordination and Integration
How is the endocrine system described in humans?
Options
- AAs a simple endocrine system
- BAs a complex system with a large number of hormones
- CAs a system with a large number of chemicals acting as hormones
- DAs a system with few hormones
Correct answer
C. As a system with a large number of chemicals acting as hormones
Step-by-step solution
Endocrine glands lack ducts and are hence, called ductless glands. Their secretions are called hormones. The classical definition of hormone as a chemical produced by endocrine glands and released into the blood and transported to a distantly located target organ has current scientific definition as follows: Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts. The new definition covers a number of new molecules in addition to the hormones secreted by the organ