Anatomy & Physiology Musculoskeletal #8

Question

Which bone cell releases calcium into the blood in response to hypocalcemia?

Answers

  1. Stem cells
    • Rationale:

      Stem cells are often referred to as immature osteoblast cells. They form in the inner surface of the bone; however, they do not release calcium into the blood in response to hypocalcemia.

  2. Osteoblasts
    • Rationale:

      Osteoblasts build remodeled bones by producing new collagen and building new bone minerals. These bone cells do not release calcium into the blood in response to hypocalcemia.

  3. Osteoclasts
    • Rationale:

      Osteoclasts break down bone and reabsorb it so that the bones can renew with remodeling and repair. These bone cells do not release calcium into the blood in response to hypocalcemia.

  4. Lining cells
    • Rationale:

      Lining cells have two specific roles in the skeletal system. The first is to protect the bones; in addition, they also release calcium into the blood in response to hypocalcemia (i.e., low serum calcium levels).

Overview

There are various types of bone cells that comprise the bones that make up the skeletal system.

Explanation

Learning Outcomes

The various kinds of cells that make up bone are: lining cells, osteoblasts, osteoclasts, osteocytes, and stem (i.e., osteogenic) cells. Lining cells are actually old osteoblasts. These cells regulate the passage of calcium into and out of the bone. In addition, they respond to hormones by making special proteins that activate the osteoclasts.

Test Taking Tip

Consider the function for each bone cell to correctly answer this question.

Video Rationale