Bone remodeling
occurs constantly during a person's lifetime
is involved in Na+ regulation
only occurs after a bone has been broken and is healing
does not occur when bones adjust to particular stresses
The Correct Answer is A
A. occurs constantly during a person's lifetime
Bone is a dynamic tissue. Remodeling occurs throughout life to adapt to stress, repair microfractures, and regulate calcium levels.
B. is involved in Na⁺ regulation
Bone remodeling primarily involves calcium and phosphate regulation, not sodium.
C. only occurs after a bone has been broken and is healing
Remodeling happens continuously, not just after fractures. Healing is one scenario, but it's not exclusive.
D. does not occur when bones adjust to particular stresses
False. One of the main purposes of remodeling is to adapt to mechanical stress (e.g., weightlifting increases bone density).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. terminal; vellus
Terminal hairs are thick and pigmented. During puberty, hairs typically change from vellus to terminal, not the reverse.
B. lanugo; vellus
Lanugo is the fine hair present on fetuses, not typical of pre-pubertal facial hair.
C. vellus; lanugo
This is also in Lanugo is not a stage in puberty; it is lost after birth.
D. lanugo; terminal
While terminal hair is correct, lanugo is irrelevant in this pubertal context.
E. vellus; terminal
During puberty, vellus hair (fine and lightly pigmented) on the face is replaced by terminal hair (thicker, darker, and coarser) under the influence of androgens.
Correct Answer is B
Explanation
A. difficulty absorbing nutrients from the intestine
This is related to gastrointestinal function, not brown fat. Brown fat is involved in thermoregulation, not nutrient absorption.
B. difficulty regulating his body temperature
Brown fat is specialized for non-shivering thermogenesis, particularly in newborns. Without it, the infant would struggle to generate body heat and maintain a stable temperature.
C. very stretchy tendons and skin
This suggests a connective tissue disorder like Ehlers-Danlos syndrome, not a defect in brown fat.
D. a reduced bone mass
Brown fat does not directly influence bone development or bone mass.
E. difficulty breathing
Respiratory function may be affected in other conditions, but brown fat deficiency does not directly impair breathing mechanics.
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