Question

How does endocrine system work without duct ?

Answer 1

the endocrine system is in charge of body processes that happen slowly, such as cell growth. Faster processes like breathing and body movement are controlled by the nervous system. But even though the nervous system and endocrine system are separate systems, they often work together to help the body function properly.

The foundations of the endocrine system are the hormones and glands. As the body's chemical messengers, hormones transfer information and instructions from one set of cells to another. Many different hormones move through the bloodstream, but each type of hormone is designed to affect only certain cells.
The secretions of endocrine system are directly poured into blood so it doesn't require any duct. Rather blood carries the hormones secreted by it to targeted organs.