Final answer:
The correct answer is the endocrine system, which is composed of hormone-producing glands like the pituitary, thyroid, pancreas, and adrenal glands. These glands secrete hormones directly into the bloodstream to regulate numerous bodily functions.
Step-by-step explanation:
The body system that consists of all the hormone-producing glands is known as the endocrine system. This system includes various glands such as the pituitary gland, which is considered the master gland, the thyroid gland, pancreas, and adrenal glands. These glands release hormones into the bloodstream, which then travel throughout the body to target cells and organs, influencing numerous bodily functions such as metabolism, growth, and sexual development. Unlike exocrine glands, such as sweat and salivary glands, endocrine glands do not use ducts and directly release hormones into the interstitial fluid and subsequently into the circulation.
The functions of the endocrine system are vast, involving the coordination and regulation of many body responses. The hormones act as chemical messengers, allowing cells and organs to communicate with each other to maintain homeostasis. The endocrine system works closely with the nervous system to ensure that the appropriate hormones are released at the correct times, thereby regulating the body's responses to stimuli, whether they be internal or external.
In summary, the correct option for the body system composed of all hormone-producing glands is the endocrine system. This is the final answer and it is supported by the two line explanation that defines the endocrine system as a network of glands that secrete hormones to regulate various body processes.