Which of the following lists only includes components of the endocrine system?

This option lists components of the digestive system rather than the endocrine system. The esophagus, colon, and stomach are involved in the mechanical and chemical breakdown of food, nutrient absorption, and waste elimination, distinct from the hormone-regulating functions of the endocrine glands.

This choice refers to components of the musculoskeletal system. Joints, cartilage, and ligaments provide structural support and facilitate movement in the body. None of these elements play a role in hormone production or regulation, which are the primary functions of the endocrine system.

This selection represents components of the nervous system, not the endocrine system. Neurons transmit signals throughout the body, while the brain and spinal cord are central to processing and responding to these signals. Although the nervous and endocrine systems interact, their components and functions are distinctly categorized.