Question

give reason why endocrine gland release theft secretions into the blood​

Answer 1

Because Endocrine glands are ductless glands therefore in order to reach the target organ hormones needs a medium to be transported to target tissues so their secretion is released into the blood

Answer 2

because unlike exocrine glands which pour their hormones into ducts to be transported where they're needed, endocrine glands pour their hormones directly into the blood to be transported to the cells