So that every bone cell is near a nutrient supply, each contains blood vessels.

Explanation of Bone Cells and Nutrient Supply

Bone cells, known as osteocytes, are essential for maintaining bone structure and health. These cells are embedded within the mineralized matrix of bones and have extensive networks through which they communicate with each other. To ensure that every bone cell receives adequate nutrients and oxygen, bone tissue is highly vascularized, meaning it contains a rich supply of blood vessels.

1. Nutrient Delivery: Blood vessels supply essential nutrients, such as calcium and phosphate, and oxygen. This supply is critical because bone cells require these substances to perform their functions and maintain bone density and strength.

2. Bone Remodeling: Bone is a dynamic tissue that undergoes continuous remodeling. The presence of blood vessels allows for the efficient removal of waste products from bone metabolism, supporting the health and longevity of osteocytes.

3. Haversion Systems: Within the bone, blood vessels are organized into systems called Haversian systems (or osteons). These systems facilitate the organized flow of blood throughout the bone, ensuring that nutrients reach all bone cells.

4. Cell Communication: Osteocytes communicate with the bone surface and the blood vessels via tiny channels called canaliculi. This communication is vital for coordinating the activities of bone formation and resorption based on the body's changing needs.

In summary, blood vessels are crucial in bone structures to provide nutrients and maintain cellular health necessary for efficient bone function.