Question

Give reason to explain why endocrine glands release their secretions into the blood directly

Answer 1

Thanks for asking the question.
Endocrine glands ae ductless glands. This means that unlike exocrine glands which pour their hormones in ducts that transport them to the target cells, endocrine cells do not have any ducts. So they pour their secretions that is hormones directly into the blood and the blood transports them to the target cells.
Hope it helps.

Answer 2

endocrine gland are the ductless gland. that means that unlike ecorine gland which pour the secretion in ducts that transform them to targets cell . endocrine glands do not have any ducts. so they pour their scretion that is harmones directly into blood and the blood transmit them to target cell