Final answer:
The central (Haversian) canals in bones contain blood vessels, nerves, and lymphatic vessels, providing a pathway for transportation of nutrients, waste, and signals throughout the bone.
Step-by-step explanation:
The central (Haversian) canals are longitudinal channels in the center of each osteon that contain blood vessels, nerves, and lymphatic vessels.
These canals, also known as Haversian canals, run down the center of each osteon and provide a pathway for the transportation of nutrients, waste, and signals throughout the bone.
For example, the blood vessels in the central canals supply oxygen and nutrients to the bone cells, while the nerves help transmit sensory information and control the functions of the bone.
The lymphatic vessels in the canals play a role in immune response and waste removal.