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What are the endocrine glands? The endocrine glands in humans are production sites for important hormones. They do not have an excretory duct, but release their secretions (hormones) directly into the blood. This is why endocrine glands are called endocrine glands. Their counterparts are exocrine glands, which release their secretions via excretory ducts to internal … হরমোন গ্রন্থি: গঠন এবং কার্যকারিতা