Which term describes the body system that uses glands to release hormones into the bloodstream?

Which term describes the body system that uses glands to release hormones into the bloodstream?

• A. Nervous system
• B. Hormones
• C. Endocrine glands
• D. Endocrine system

Answer: (D)

This is about chemical signaling that travels through the blood to affect distant parts of the body. The system that uses glands to release hormones into the bloodstream is the endocrine system. Glands such as the pituitary, thyroid, adrenal, and pancreas produce hormones that travel in the blood to target tissues, coordinating processes like growth, metabolism, and stress responses. This differs from the nervous system, which relies on electrical signals and neurotransmitters at synapses. Endocrine glands are the individual organs that secrete hormones, while the endocrine system is the whole network that enables this long‑range hormonal communication. Examples include insulin from the pancreas and thyroid hormones from the thyroid.

This is about chemical signaling that travels through the blood to affect distant parts of the body. The system that uses glands to release hormones into the bloodstream is the endocrine system. Glands such as the pituitary, thyroid, adrenal, and pancreas produce hormones that travel in the blood to target tissues, coordinating processes like growth, metabolism, and stress responses. This differs from the nervous system, which relies on electrical signals and neurotransmitters at synapses. Endocrine glands are the individual organs that secrete hormones, while the endocrine system is the whole network that enables this long‑range hormonal communication. Examples include insulin from the pancreas and thyroid hormones from the thyroid.