Which term describes the collection of glands that secrete hormones into the bloodstream?

The term that describes the collection of glands that secrete hormones into the bloodstream is the endocrine system. This system plays a crucial role in regulating various bodily functions by releasing hormones directly into the circulatory system, where they travel to target organs or tissues to elicit specific responses, thus regulating processes such as metabolism, growth and development, and mood.

The endocrine system is composed of several key glands, including the pituitary, thyroid, adrenal glands, and pancreas, each responsible for producing different hormones. Hormones are pivotal for maintaining homeostasis in the body, influencing physiological functions and responses.

In contrast, the excretory system is responsible for removing waste products from the body, the nervous system primarily focuses on transmitting signals through nerve impulses, and the digestive system is involved in the breakdown and absorption of nutrients from food. Therefore, the unique function of the endocrine system in hormone secretion distinguishes it from these other systems.