What is the system of glands called that secretes hormones into the circulatory system?

The system of glands responsible for secreting hormones into the circulatory system is known as the endocrine system. This system comprises various glands, such as the pituitary, thyroid, adrenal, and pancreas, which release hormones that regulate numerous bodily functions, including metabolism, growth, reproduction, and mood. Unlike the nervous system, which communicates through electrical impulses and neurotransmitters, the endocrine system uses hormones as chemical messengers to relay information throughout the body. This method of regulation is generally slower but has longer-lasting effects, making it crucial for maintaining homeostasis.

The other systems listed have different primary functions. The nervous system focuses on rapid communication and coordination between different body parts, while the circulatory system transports blood, nutrients, gases, and hormones, and the lymphatic system is mainly involved in fluid balance and immune responses. Thus, the correct identification of the endocrine system highlights its unique role in hormonal regulation.