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Multiple Choice
What is the first step in urine formation?
A
Tubular reabsorption
B
Tubular secretion
C
Excretion
D
Glomerular filtration
Verified step by step guidance
1
Understand the process of urine formation, which involves several key steps: glomerular filtration, tubular reabsorption, tubular secretion, and excretion.
Recognize that the first step in urine formation is glomerular filtration, which occurs in the kidneys.
Learn that during glomerular filtration, blood pressure forces water and solutes out of the blood in the glomerulus into the Bowman's capsule, forming a filtrate.
Differentiate glomerular filtration from the subsequent steps: tubular reabsorption (where useful substances are reabsorbed into the blood) and tubular secretion (where additional waste products are added to the filtrate).
Remember that excretion is the final step, where urine is expelled from the body, and it follows the processes of filtration, reabsorption, and secretion.