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Which of the following is a function of the skeletal system?
*Protection of Internal organs
*Blood cell production
The expanded articular end of an epiphysis that is separated from the shaft by a narrower neck is termed a(n) ________.
The ________ interactions allow bone to be strong, somewhat flexible, and highly resistant to shattering.
How would removing hydroxyapatite from bone matrix affect the physical properties of a bone?
The bone would be more flexible.
Cells that free calcium from bone to maintain blood calcium levels are called ________.
Cells that are found in small depressions on the endosteal surfaces are the ________.
The type of bone that is adapted to withstand stresses that arrive from many directions is ________ bone.
Which of the following is a characteristic of bone?
The bone matrix is very dense and contains deposits of calcium salts.
Which statement is true regarding calcium in bone matrix?
Calcium is found in crystals called hydroxyapatite.
Blood is distributed from the surface of a bone to deeper central canals through channels known as ________.
The articular cartilage of a typical long bone is composed of what type of cartilage?
Which of the following is formed by intramembranous ossification?
The roof of the skull and the clavicle
The following are important steps in the process of endochondral ossification.
3.Chondrocytes enlarge tand the surrounding matrix begins to calcify.
1. Enlarged chondrocyes die
4. Blood vessels invade the perichondrium
5. Perichondrial cells become osteoblasts and produce a thin shell of bone
2. Osteoblasts replace calcified cartilage with spongy bone
Which of the following statements about Marfan's syndrome is false?
Results in short, stubby fingers
Bone growth in length occurs by mitosis of?
Cartilage cells in the epiphyseal side of the metaphysis.
Suppose that epiphyseal lines appear in a 10-year-old's long bones. Which of the following statements is therefore true?
The epiphyseal plates have ossified and further growth in length is not possible.
When cartilage is produced at the epiphyseal side of the metaphysis at the same rate as bone is deposited on the opposite side, bones:
The following are major steps in the process of intramembranous ossification:
4. Mesenchymal cells aggregate into a connective tissue layer
2. Osteoblasts differentiate within mesenchymal connective tissue
1. Clusters of osteoblasts secrete a matrix that becomes mineralized
3. Trabeculae of bone grow out from the ossification centers
What type of tissue is replaced in the embryo during endochondral ossification?
Parathyroid hormone functions in all of the following ways, except that it?
Inhibits calcitonin secretion.
Hundreds of years ago explorers often died of scurvy. How can this bone-related disease be prevented?
Supplement the diet with fresh fruit rich in Vitamin C
How is vitamin D (vitamin D3) related to calcium homeostasis in bone?
Vitamin D is involved in calcium absorption by the digestive tract so calcium is available for ossification and remodeling.
The disease osteomalacia causes calcium loss from the skeleton, which would result in bones that are?
Weaker and more flexible.
While on a school skiing trip in Colorado, Heidi falls and breaks her tibia and fibula in a Pott fracture. What would you expect as a prominent part of her clinical assessment several hours after the fall?
Put the following steps of bone repair in correct sequence:
1. Cartilage in the external callus is replaced by bone.
2. A hematoma occurs.
3. An internal callus forms at the site of injury.
4. Osteoclasts remodel the bone at the site of repair.
Damage to a bone because of extreme load, sudden impact, or stresses applied from an unusual direction is called a(n) ________.
A transverse fracture of the wrist that may be comminuted is called a(n) ________ fracture.
The fracture of vertebrae subjected to extreme vertical stress is called a(n) ________ fracture.
When stress is applied to a bone,
The minerals in the bone produce a weak electrical field that attracts osteoblasts.
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