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 A
Explanation
A. Sebaceous gland: Sebaceous glands secrete sebum (an oily substance) that lubricates and waterproofs skin and hair.
B. Apocrine gland:Apocrine glands produce a protein-rich sweat (body odor after bacterial action), found in axilla/groin; not the primary source of sebum.
C. Eccrine gland: Eccrine glands produce watery sweat for thermoregulation distributed over much of the body.
D. Ceruminous gland: Ceruminous glands are modified sweat glands in the ear canal that produce cerumen (earwax), not sebum for hair/skin lubrication.
Correct Answer is A
Explanation
A. To bind to troponin, allowing cross-bridge formation:Calcium ions bind to troponin, causing a conformational change that exposes myosin-binding sites on actin and permits cross-bridge cycling.
B. To stimulate the release of acetylcholine:Calcium influx into the presynaptic nerve terminal triggers acetylcholine release, but the primary role of calcium in muscle contraction is within the muscle fiber at troponin.
C. To provide energy for muscle contraction:Energy for contraction is supplied by ATP, not by calcium ions.
D. To transport oxygen to muscle cells:Oxygen transport is the role of hemoglobin and myoglobin, not calcium ions.
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