Where does hematopoiesis occur in adults?
Endosteum
Red bone marrow
Periosteum
Yellow marrow
The Correct Answer is B
A. Endosteum: The endosteum lines internal bone surfaces and participates in bone remodeling but is not the primary site of hematopoiesis.
B. Red bone marrow: Red bone marrow is the active marrow where hematopoiesis (production of blood cells) occurs in adults, located in pelvis, vertebrae, ribs, sternum, and proximal long bones.
C. Periosteum: The periosteum covers the outer bone surface and provides vascular supply and osteogenic cells for bone growth and repair, not the main hematopoietic site.
D. Yellow marrow: Yellow marrow is rich in fat and predominantly serves as an energy store; it can revert to red marrow in severe blood loss but is not the usual site of active hematopoiesis
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. To produce synovial fluid:Synovial fluid is produced by the synovial membrane (lining of the joint capsule), not by the articular cartilage.
B. To connect bones:Structural connections between bones are provided by ligaments rather than articular cartilage.
C. To absorb shock and reduce friction:Articular cartilage provides a smooth, resilient surface that distributes load and reduces friction between joint surfaces during movement.
D. To facilitate nerve signaling:Articular cartilage is avascular and largely aneural, so it does not play a direct role in nerve signaling.
Correct Answer is B
Explanation
A. Absorbing shock:Shock absorption is mainly performed by articular cartilage and synovial fluid rather than ligaments.
B. Providing joint stability:Ligaments are strong fibrous bands that connect bones to bones, maintaining alignment and stability during movement.
C. Connecting muscles to bones:This function is carried out by tendons, not ligaments.
D. Lubricating the joint:Lubrication is provided by synovial fluid within the joint capsule, not by ligaments.
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