How many significant figures are there in the answer to the following problem? 
Definitions:
Collecting Duct
A series of tubules and ducts in the kidney that transport urine from the nephrons to the renal pelvis.
Ureter
A pair of tubes that carry urine from the kidneys to the bladder, facilitating the removal of waste from the body.
Glomerular Capsule
A cup-like sack at the beginning of the tubular component of a nephron in the kidney that performs the first step in filtering blood to form urine.
Simple Cuboidal
A type of epithelial tissue with cube-shaped cells, often found lining glands and ducts, playing roles in secretion and absorption.
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