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what three structures allow bones to receive nutrients and oxygen? i need help for some anatomy homework.

For one thing, our bones are highly vascularized... It means that there are many blood vessels inside our bones... So, these blood vessels deliver O2 and nutrients in our bones... ok?

Three main types of cannals: canaliculi, Haversian canals and Volkmann's canals.

The canaliculi join osteocytes. Haversian canals are thicker, central in the osteone and are longitudinal through the bone. The Volkmann canals are transverse tunnels that go into the bone from the exterior and allow vascularization to enter the osseous tissue.

As mentioned above, bone is vascularized but that doesn't explain how the blood in the vessels are transported into the bone itself. Since bone tissue is hard it requires canals or tunnels to get the nutrients to the cells inside it (osteocytes). Furthermore, these cells have long protrusions of their cytoplasm within these tunnels that touch other osteocytes, they are joined at these unions and can transport nutrients, etc. to eachother.

Bones are rigid organs that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red and white blood cells and store minerals. Because bones come in a variety of shapes and have a complex internal and external structure, they are lightweight, yet strong and hard, in addition to fulfilling their many other functions. One of the types of tissues that makes up bone is the mineralized osseous tissue, also called bone tissue, that gives it rigidity and honeycomb-like three-dimensional internal structure. Other types of tissue found in bones include marrow, endosteum and periosteum, nerves, blood vessels and cartilage. There are 206 bones in the adult body.