Question

bodys system of glands that release their secretions, called hormones, directly into the bloodstream
neuroendocrine cell
dopamine system
gi tract
metabolic process
endocrine system

Explanation:

The endocrine system is a collection of glands that secrete hormones directly into the bloodstream. Neuroendocrine cells are specialized cells within the endocrine - related system, not the whole system. The dopamine system is related to neurotransmitters, not the overall gland - hormone - blood - stream system. The GI tract is part of the digestive system. Metabolic processes are chemical reactions in the body, not the gland system.

Answer:

endocrine system