What gland produces and releases hormones directly into the bloodstream?

The production and release of hormones directly into the bloodstream is a primary function of the endocrine gland. Endocrine glands, such as the pituitary, adrenal, and thyroid glands, secrete hormones that travel through the circulatory system to target organs or tissues, where they exert their effects. This direct release is essential for maintaining various bodily functions, including metabolism, growth, and mood regulation.

In contrast, exocrine glands release substances through ducts to specific locations, such as the skin or digestive tract. Salivary glands, for example, secrete saliva into the mouth, which is a localized effect rather than a systemic one. Although the thyroid gland is indeed an endocrine gland that produces hormones, the question specifically asks for the type of gland responsible for hormonal release into the bloodstream, which encompasses all endocrine glands, not just one specific type.