What is the functional unit of the kidneys?

Rationale

The nephron is the functional unit of the kidneys.

The nephron is the microscopic structure in the kidney responsible for the filtration, reabsorption, secretion, and excretion of numerous substances to maintain homeostasis in the body.

A (Loop of Henle) YOUR ANSWER

Although the Loop of Henle plays a critical role in the nephron's function, it is only a part of the nephron, not the whole functional unit itself. Its main function is to concentrate urine by reabsorbing water and salts.

B (Ureter) YOUR ANSWER

The ureter is not the functional unit of the kidneys. Instead, it serves as a conduit for urine from the kidneys to the bladder. Thus, it is involved in excretion but does not perform the necessary filtration and reabsorption functions of the nephron.

C (Glomerulus) YOUR ANSWER

The glomerulus, like the Loop of Henle, is a critical part of the nephron. It is where blood is initially filtered to form urine. However, it cannot function independently from the rest of the nephron and therefore is not the functional unit of the kidneys.

D (Nephron) CORRECT

The nephron is the fundamental functional unit of the kidneys. Each kidney contains around a million nephrons. They are responsible for filtering the blood and removing waste products, but also reabsorbing water, glucose, and electrolytes back into the blood to maintain balance in the body.

Conclusion

The nephron is the functional unit of the kidneys as it carries out all the necessary processes to filter blood, remove waste products, and maintain homeostasis. While the Loop of Henle, ureter, and glomerulus are all essential components or pathways within the urinary system, they are individually only parts of the process and do not independently perform all the functions of the nephron.

What is the functional unit of the kidneys?

The nephron is the functional unit of the kidneys.

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