Case Study Mod. 2 Part I— “Marissa” Questions

Demmi Ware

Module 04 Case Study: Bone Tissue

Part I— “Marissa” Questions

1. Describe bone tissue and the role each component plays in bone physiology and remodeling. What is the difference between compact and spongy bone? (2 points)

Bone tissue is what your bones are comprised of. This includes: osteocytes, osteoblasts, osteoclast, and osteogenic. Osteoblasts are bone cells that create bone matrix. Osteocytes are osteoblasts that have become embedded into the bone matrix. Osteoclasts are bigger bone cells that have multiple nuclei, and absorb bone tissue during growth and healing. Osteogenic cells are the generator cells that create bone. (OpenStax, 2013, pp. 171-272) There are several differences between compact and spongy bone. First is their location within the bone. Compact bone makes up the length or diaphysis, while the spongy bone is located in the epiphysis. Spongy bone is where marrow is found, and has the appearance of a sponge. Compact bone is like several layers of drywall that create strength and support. (OpenStax, 2013, p. 207)

2. Explain the relationship between calcium and bones. (1 point)

The relationship between calcium and bones is strength. Calcium is essential for healthy bone growth along with several other minerals.

3. Explain how the body controls calcium levels in the bones and blood. Be sure to describe the roles of parathyroid hormone (PTH) and calcitonin in detail. (2 points)

The body controls calcium levels in the bones and blood via osteocytes, and the PTH. The PTH is responsible for detecting when the body is in need of more calcium from the bones. This triggers the release of calcium from the bones via the osteocytes breaking down bone matrix and releasing the calcium, as well as decreasing activity of osteoblasts. When there is too much or enough calcium in the blood, calcitonin is released triggering the activity of the osteocytes to decrease, and osteoblasts to increase. (OpenStax, 2013, p. 231)

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