A patient with chronic kidney disease develops osteomalacia. Which mechanism explains why impaired kidney function affects bone mineralization?

💡 Explanation

Impaired kidney function reduces the activation of vitamin D to its active form, calcitriol, because the kidneys are essential for this conversion. Therefore, decreased vitamin D activation reduces calcium absorption, leading to impaired bone mineralization, rather than increased calcium excretion causing direct mineral loss.

• If a patient has a mutation causing constitutively active type 2 iodothyronine deiodinase (D2) in their astrocytes, which consequence follows in thyroid hormone regulation?
• If a burn injury damages the reticular dermis, why does long-term skin regeneration often result in hypertrophic scarring rather than complete restoration?
• Which failure increases risk of osmotic demyelination following rapid hyponatremia correction?
• An oncologic surgeon removes axillary lymph nodes during a breast cancer resection. Which outcome is likely to occur in the affected arm because of this lymphatic disruption?
• An individual abruptly stops taking a prescribed hypnotic medication that enhances GABA activity to address chronic insomnia. Which consequence follows due to rapid receptor down-regulation?
• Why does signal transduction in a demyelinated neuron slow down action potential propagation following an initial stimulus?