What is the primary function of the endocrine gland?

• A. Produces digestive enzymes
• B. Regulates homeostasis by hormonal secretion and communication
• C. Filters blood
• D. Produces gametes

Answer: (B)

Endocrine signaling uses hormones released into the bloodstream to coordinate activities across distant organs. The main job of endocrine glands is to regulate homeostasis by hormonal secretion and communication, shaping processes like metabolism, growth, stress responses, and reproduction. Hormones travel through the blood to target tissues and alter their activity, typically with slower onset but longer-lasting effects than nerve signals, and are often regulated by feedback loops to keep the body's internal conditions stable. The other roles described correspond to different systems: producing digestive enzymes is an exocrine function involved in digestion, filtering blood is the kidneys’ job, and producing gametes is a reproductive function. The description that best matches what endocrine glands do is the regulation of homeostasis through hormonal signaling and communication.