Exam 6: Bone Tissue
What bone disorder is best described as inadequate calcification of the extracellular matrix, usually caused by a vitamin D deficiency?
C
Which of the following best describes a tuberosity?
B
Draw a diagram of a typical mature long bone shown in sagittal section. Label the regions and tissues and identify the sites for red and yellow bone marrow.
A typical mature long bone shown in sagittal section would have the following labeled regions and tissues:
1. Epiphysis: The rounded end of the bone, which is covered with articular cartilage for smooth movement at the joint.
2. Metaphysis: The region between the epiphysis and diaphysis, where the growth plate is located during development.
3. Diaphysis: The shaft of the bone, which is composed of compact bone tissue for strength and support.
4. Medullary cavity: The hollow space within the diaphysis, which contains bone marrow.
5. Endosteum: The thin membrane lining the medullary cavity, which contains osteoprogenitor cells involved in bone remodeling.
6. Periosteum: The tough outer membrane covering the bone, which contains blood vessels and nerves for nourishment and sensation.
The sites for red and yellow bone marrow can also be identified in the diagram. Red bone marrow is typically found in the spongy bone of the epiphysis and some areas of the metaphysis, where it is responsible for producing blood cells. Yellow bone marrow, which consists mainly of fat cells, is found in the medullary cavity of the diaphysis in adults.
The spaces in bone tissue that contain osteocytes are called _____.
The region of a long bone where the epiphysis and diaphysis join is called the _____.
The nutrient artery of a long bone branches into proximal, distal, epiphyseal, and metaphyseal branches, and therefore supplies the entire bone with blood.
Sesamoid and sutural bones are the two types of bones that are the most variable in number in the human body.
Explain why damage to the epiphyseal plate in childhood may result in the fractured bone being shorter than normal once adult stature is reached.
A Colles' fracture involves the distal end of the lateral forearm bone (radius).
Explain what is meant by "hot spots" and "cold spots" seen on a diagnostic bone scan.
Which of the following are true of yellow bone marrow? 1. It is the main site of blood cell production.
2) It is located in the medullary (marrow) cavities of long bones.
3) It is located in hipbones, sternum, ribs, and vertebrae.
4) It is a site of energy storage in the form of triglycerides.
5) It becomes more abundant relative to red bone marrow with increasing age due to the conversion of red bone marrow to yellow bone marrow.
At birth, all bones are cartilaginous. Ossification occurs only after birth.
The strength of the diaphysis of a long bone is due to 1. the presence of compact bone.
2) the longitudinal orientation of the osteons.
3) the presence of trabeculae.
A bone fracture in which the broken ends of the bone can be seen protruding from the skin is called a/an _____ fracture.
Which one of the following is characteristic of spongy bone tissue, but not of compact bone tissue?
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