Physicians often ask for urine samples collected over a 24-hour period, rather than a single sample. Why?
What will be an ideal response?
Often the information needed for a diagnosis is the amount of a substance being lost per day and not simply its concentration in the urine. Because the amount of water present in the urine varies throughout the day, the only reliable way to estimate quantities per day is measure both average concentration (g/ml) and the total volume (ml/day). The product of these two quantities is the amount per day (g/day).
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Of the following layers of the heart wall, which consumes the most energy?
A. Epicardium B. Myocardium C. Endocardium D. Visceral pericardium
The paranasal sinuses are located in all of the following bones except the
A) frontal bone. B) ethmoid bone. C) sphenoid bone. D) maxillae. E) vomer.
Which of the following is involved in the myelination of axons of the central nervous system?
A) microglia B) astrocytes C) oligodendrocytes D) Schwann cells
The cytoplasm consists of organelles suspended in ________.
Fill in the blank(s) with the appropriate word(s).