_____ are the most movable joints.
symphyses
synovial joints
syndesmoses
gomphoses
synchondroses
The Correct Answer is B
Choice A reason: Symphyses are cartilaginous joints where bones are joined by fibrocartilage. They allow limited movement, such as in the pubic symphysis, but are not the most movable joints.
Choice B reason: Synovial joints are the most movable type of joints in the body. They feature a joint cavity filled with synovial fluid, which reduces friction and allows for a wide range of motion. Examples include the shoulder, hip, and knee joints.
Choice C reason: Syndesmoses are fibrous joints where bones are connected by ligaments. They allow more movement than sutures but are still relatively limited compared to synovial joints.
Choice D reason: Gomphoses are immovable joints found between teeth and their sockets. These joints are highly stable but do not permit movement.
Choice E reason: Synchondroses are cartilaginous joints where bones are joined by hyaline cartilage. These joints are typically immovable or allow very slight movement, such as in the epiphyseal plates of growing bones.
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Related Questions
Correct Answer is D
Explanation
Choice A reason: A meatus is a canal-like passageway through bone, such as the external auditory meatus. It does not describe a projection and is not involved in articulation.
Choice B reason: A fossa is a shallow depression in a bone, often serving as a site for muscle attachment or articulation. However, it is not a projection but rather a concavity.
Choice C reason: An epicondyle is a raised area on or above a condyle, typically serving as a site for muscle attachment. While it is a projection, it is not the rounded articular type described in the question.
Choice D reason: A condyle is a rounded articular projection that typically forms part of a joint. It allows for smooth articulation with another bone and is the correct term for the structure described.
Choice E reason: A foramen is a hole or opening in a bone that allows the passage of nerves and blood vessels. It is not a projection and does not serve an articulating function.
Correct Answer is E
Explanation
Choice A reason: Osteoclasts are large, multinucleated cells responsible for bone resorption. They do not arise from osteoblasts and are not involved in matrix secretion.
Choice B reason: Osteogenic cells are stem cells that differentiate into osteoblasts. They are precursors, not the result of matrix entrapment.
Choice C reason: Chondrocytes are cartilage cells, not bone cells. They originate from chondroblasts and are unrelated to osteoblast transformation.
Choice D reason: Osteoid refers to the unmineralized bone matrix secreted by osteoblasts. "Osteoid cell" is not a recognized term for a mature bone cell.
Choice E reason: Osteocyte is the correct answer. Once an osteoblast becomes encased in the bone matrix it secretes, it differentiates into an osteocyte. Osteocytes reside in lacunae and maintain bone tissue.
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