Which type of synovial joint is characterized by two flat bone surfaces sliding over each other?
Hinge joint
Plane joint
Ball-and-socket joint
Saddle joint
The Correct Answer is B
A. Hinge joint: A hinge joint allows movement in one plane (flexion/extension) like the elbow, not sliding between flat surfaces.
B. Plane joint: Plane (gliding) joints have relatively flat articular surfaces that permit sliding or gliding motions between bones.
C. Ball-and-socket joint: Ball-and-socket joints (shoulder, hip) permit multiaxial movement with a rounded head fitting into a socket rather than flat-surface sliding.
D. Saddle joint: Saddle joints have complementary concave/convex surfaces that allow biaxial movement (e.g., thumb carpometacarpal), not simple flat gliding.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Synovial:Synovial describes a freely movable joint with a joint cavity and synovial fluid, not an immovable joint.
B. Amphiarthrosis:Amphiarthrosis refers to a joint that permits slight movement, such as the pubic symphysis.
C. Synarthrosis:Synarthrosis denotes an immovable joint where bones are tightly joined, for example cranial sutures.
D. Diarthrosis:Diarthrosis is another term for freely movable joints (synovial joints) that allow a wide range of motion.
Correct Answer is A
Explanation
A. Hormone production:While bone cells secrete factors (for example osteocalcin) that have endocrine effects, classical major functions of the skeleton focus on support, protection, mineral storage, and hematopoiesis rather than systemic hormone production.
B. Mineral storage:The skeleton stores minerals (notably calcium and phosphate) and helps regulate their blood levels.
C. Support and protection:The skeleton provides structural support for the body and protects vital organs (for example the skull protects the brain).
D. Blood cell formation:Hematopoiesis occurs in red bone marrow, producing red cells, white cells, and platelets.
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