When Blood Ca²⁺ Levels Fall Below Normal, in What Ways

question 105

Multiple Choice

When blood Ca²⁺ levels fall below normal, in what ways do the kidneys help restore them toward normal?

• A) by increasing 1,25-dihydroxyvitamin D₃ formation, decreasing tubular phosphate reabsorption, and increasing tubular Ca²⁺ reabsorption
• B) by increasing 1,25-dihydroxyvitamin D₃ formation, increasing tubular phosphate reabsorption, and increasing tubular Ca²⁺ reabsorption
• C) by decreasing 1,25-dihydroxyvitamin D₃ formation, increasing tubular phosphate reabsorption, and increasing tubular Ca²⁺ reabsorption
• D) Increasing 1,25-dihydroxyvitamin D₃ formation and increasing secretion of parathyroid hormone
• E) by increasing renal secretion of parathyroid hormone and increasing bone resorption

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Definitions:

Machine-Hours

A measure of the amount of time a machine is operated, used in manufacturing to allocate costs or determine efficiency.

Equipment Depreciation

The process of allocating the cost of tangible assets over their useful lives, reflecting the wear and tear, or obsolescence of physical equipment.

Machining Activity

The process of removing material from a piece of work through methods like cutting, drilling, or milling.

Activity-Based Costing

A costing method that assigns overhead and indirect costs to related products and services based on their usage of resources.