The figure shows a distance versus time graph for an object. 
-The acceleration of the moving object is
Definitions:
Na+
The symbol for sodium ions, which are essential for various bodily functions including fluid balance, muscle contraction, and nerve impulse transmission.
Tubular Secretion
A process in the nephrons of the kidney where certain substances are selected from the blood and secreted into the tubular fluid for excretion.
Distal Convoluted Tubule
Part of the nephron in the kidney primarily involved in the reabsorption of water and solutes, significantly contributing to the regulation of potassium, sodium, calcium, and pH.
Collecting Duct
A series of tubules and ducts in the kidney that process urine, concentrating it before it moves to the bladder.
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