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Histology-World!
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Histology Testbank: Bone 2a |
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Instructions: For each histology question, pick the one best answer. This histology test bank is also useful for the histology questions on the USMLE (USMLE step 1). 1. Answer: c Compact bone is also called dense bone. Compact bone has the Haversian system. Immature bone is woven bone. It is nonlamellar bone or bundle bone. Spongy bone is also referred to as cancellous bone. The mineralized tissue is seen as spicules. Marrow spaces are also present. 2. Answer: e The mature cell in cartilage is a chondrocyte. It rests in a lacunae surrounded by matrix. A chondroblast is an immature cartilage cell which produces the cartilaginous matrix. An osteocyte is a mature bone cell. An osteoclast is a bone cell which is involved in resorption of bone. A bone lining cell is a resting osteoblast. 3. Answer: a Calcium is in a mineral structure in bone and tooth enamel called hydroxyapatite. The chemical formula is [Ca10 (PO4)6(OH)2] Calcite crystals are calcium carbonate. The main component of limestone is calcite and seashells are made of calcite. However, calcite crystals are not found in man. Tourmaline is a crystal found in nature. Pink-red tourmaline is called rubellite. Blue tourmaline is known as indicolite. Tourmaline crystals are not found in man, although sometimes they are found on the necks and fingers of women in the form of jewelry. 4. Answer: b An osteoclast is a multinucleated cell involved in the degradation of bone. It is a bone resorbing cell. An osteon is the cylindrical structure with bone. An osteon is also called a Haversian system. The mature bone cell is called an osteocyte. It sits in a space, called a lacuna. An osteoblast is an immature bone cell. The osteoblast is the bone forming cell. Osteoid is unmineralized bone matrix. 5. Answer: b Sharpey's fibers are collagen fibers that extend into a bone at an angle. 6. Answer: e Canaliculi are the little tunnels within bone. Sharpey's fibers are collagen fibers that extend into a bone at an angle. Trabeculae are the spicules seen with spongy bone. Tome's process is seen in teeth, this process is responsible for enamel production. An osteocyte rests in a space called a lacuna. 7. Answer: d Intramembranous bone formation is the process of bone formation where the bone is formed without a cartilage template. Endochondral bone formation is the process of bone formation where the bone is formed using a cartilage template. 8. Answer: a Red marrow contains active hematopoietic tissue. Yellow marrow is primarily fat. 9. Answer: d An osteoclast is a multinucleated cell involved in the degradation of bone. It is a bone resorbing cell. An osteon is the cylindrical structure with bone. An osteon is also called a Haversian system. The mature bone cell is called an osteocyte. It sits in a space, called a lacuna. An osteoblast is an immature bone cell. The osteoblast is the bone forming cell. Osteoid is unmineralized bone matrix. 10. Answer: e Compact bone is also called dense bone. Compact bone has the Haversian system. Immature bone is woven bone. It is nonlamellar bone or bundle bone. Spongy bone is also referred to as cancellous bone. The mineralized tissue is seen as spicules. Marrow spaces are also present. |
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