What is the basic structural unit of compact bone tissue? stroma lamellae lacunae

The basic structural unit of compact bone tissue is called an **osteon**, also known as a Haversian system. However, among the options you provided, **lamellae** is the most relevant term. Lamellae are the concentric rings of bone matrix that make up the osteon. To clarify the other terms: - **Stroma** generally refers to the supportive tissue of an organ, not specific to bone. - **Lacunae** are small cavities within the bone matrix that house osteocytes (bone cells), but they are not the structural unit itself. So, while the osteon is the complete structural unit, lamellae are a key component of that unit.