The functional units of the kidneys are called nephrons. Here are the steps to explain their function:

1. Filtration: Each nephron begins with a glomerulus, a tiny ball of capillaries (blood vessels). The glomerulus filters your blood, and the filtrate, which contains waste products and substances your body needs (like glucose and amino acids), moves into the tubule of the nephron.

2. Reabsorption: As the filtrate moves through the tubule, the nephron reabsorbs what your body needs — sending the nutrients back into the bloodstream.

3. Secretion: Some substances, such as hydrogen ions, potassium ions, and certain drugs, are removed from the blood in a process called secretion. They are transported into the filtrate.

4. Excretion: The remaining fluid and waste products form urine, which flows from the nephrons to the renal pelvis. The renal pelvis is a funnel-shaped space in the innermost part of the kidney. The urine then flows from the renal pelvis to the bladder via the ureter.

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The functional units of the kidneys are called nephrons. Here are the steps to explain their function:

1. Filtration: Each nephron begins with a glomerulus, a tiny ball of capillaries (blood vessels). The glomerulus filters your blood, and the filtrate, which contains waste products and substances your body needs (like glucose and amino acids), moves into the tubule of the nephron.

2. Reabsorption: As the filtrate moves through the tubule, the nephron reabsorbs what your body needs — sending the nutrients back into the bloodstream.

3. Secretion: Some substances, such as hydrogen ions, potassium ions, and certain drugs, are removed from the blood in a process called secretion. They are transported into the filtrate.

4. Excretion: The remaining fluid and waste products form urine, which flows from the nephrons to the renal pelvis. The renal pelvis is a funnel-shaped space in the innermost part of the kidney. The urine then flows from the renal pelvis to the bladder via the ureter.

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The functional units of the kidneys are called nephrons. Here are the steps to explain their function:

1. Filtration: Each nephron begins with a glomerulus, a tiny ball of capillaries (blood vessels). The glomerulus filters your blood, and the filtrate, which contains waste products and substances your body needs (like glucose and amino acids), moves into the tubule of the nephron.

2. Reabsorption: As the filtrate moves through the tubule, the nephron reabsorbs what your body needs — sending the nutrients back into the bloodstream.

3. Secretion: Some substances, such as hydrogen ions, potassium ions, and certain drugs, are removed from the blood in a process called secretion. They are transported into the filtrate.

4. Excretion: The remaining fluid and waste products form urine, which flows from the nephrons to the renal pelvis. The renal pelvis is a funnel-shaped space in the innermost part of the kidney. The urine then flows from the renal pelvis to the bladder via the ureter.

What are the functional units of the kidneys? [4]

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