Exam 29: Support, Protection, and Movement

Correct Answer:

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Compact bone, also known as cortical bone, is one of the two types of osseous tissue found in bones. It is dense and forms the outer layer of most bones in the body. The microscopic structure of compact bone is made up of repeating units called osteons, or Haversian systems.

Each osteon consists of concentric layers of bone tissue called lamellae, which surround a central canal known as the Haversian canal. This canal contains blood vessels, lymphatic vessels, and nerves that supply the bone. Radiating out from the central canal are small channels called canaliculi, which allow for the exchange of nutrients and waste products between osteocytes, the bone cells located within the lamellae.

The functions of the various parts of compact bone are as follows:
- Lamellae: These concentric layers of bone tissue provide strength and support to the bone, helping to resist bending and twisting forces.
- Haversian canal: This central canal houses blood vessels, lymphatic vessels, and nerves that supply the bone with nutrients and oxygen, as well as remove waste products.
- Canaliculi: These small channels allow for the exchange of nutrients and waste products between osteocytes, ensuring the health and viability of the bone tissue.

In summary, the microscopic structure of compact bone is designed to provide strength, support, and nourishment to the bone, allowing it to withstand the forces and stresses placed upon it during everyday activities.