A bread-making factory has the production process shown in the figure below. There are five operations in sequence. The product only needs to go through one of the parallel machines in each case where parallel machines exist. What is the bottleneck operation of this process? 
Definitions:
Sodium Ions
Positively charged ions of sodium (Na+), essential for various physiological functions including the regulation of blood pressure and volume.
Tubular Reabsorption
Movement of materials, by means of diffusion, active transport, or symport, from the filtrate within a nephron to the blood.
Tubular Secretion
A process in the nephrons of the kidneys where substances are added to the tubular fluid for excretion, helping to regulate blood pH and remove toxins.
Urine Volume
The total amount of urine excreted by the kidneys over a given period, important in assessing kidney function and fluid balance.
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