functions of the skeletal system other than supporting the body and protecting some of the internal organs.

Ch. 6 Lecture Assignment Questions:

1. Explain two functions of the skeletal system other than supporting the body and protecting some of the internal organs. (2pt)

2. Give an example of each of the following types of bone: (0.25pt each)

1. irregular

2. flat

3. long

4. short

3. Describe the functions of the four types of bone cells: (0.5pt each)

1. osteocytes

2. osteoprogenitor cells

3. osteoblasts

4. osteoclasts

4. Matrix components:

1. Which substance makes up about 1/3 of the weight of the bone matrix? Describe its function. (1pt)

2. Which substance makes up the other 2/3 of the weight of the matrix? Describe its function. (1pt)

3. Which of these two substances is organic? Which is inorganic? (1pt)

4. Describe the appearance and dysfunction of the bone tissue if you were lacking the substance from (1). Lack of which vitamin might cause this? (1.5pt)

5. Describe the appearance and dysfunction of the bone tissue if you were lacking the substance from (2). Lack of which vitamin might cause this? (1.5pt)

5. Define each of the following: (0.25pt each)

1. osteons

2. central canals

3. canaliculi

4. lamellae

5. lacunae

6. periosteum

7. endosteum

8. trabeculae

6. Ossification:

1. In endochondral ossification, what is the original source of osteoblasts? (0.5pt)

2. During intramembranous ossification, which type of tissue is replaced by bone? (0.5pt)

3. How could x-rays of the femur be used to determine whether a person has reached full height? (1pt)

7. Homeostasis:

1. Under what condition is calcitonin released? What effect does it have on blood calcium concentrations and how does it produce this effect? (2pt)

2. Under what condition is parathyroid hormone released? What effect does it have on blood calcium concentrations and how does it produce this effect? (2pt)

8. Why is osteopenia more common in older women than in older men? (1pt)

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