Your kidneys are bean-shaped organs that play a vital role in your overall health, and gaining an understanding of how your kidneys work, what they do, and why they need to be kept healthy can help you feel more inclined to protect them. This FKP Kidney Health blog post will discuss kidney function in-depth, including kidney function as it relates to proteinuria.
In addition to providing an overview of kidney anatomy, we’ll share information about the following topics related to how the kidneys work:
- Nephrons and Filtration
- Filtration Process
- Regulation of Electrolytes
- Waste Filtration
- Protein Retention
Then, we’ll discuss proteinuria—the presence of protein in your urine. We’ll define proteinuria, explain its significance, and encourage you to preserve the health of your kidneys so their function doesn’t gradually decline. As always, thank you for your time spent on the FKP Kidney Health blog, and feel free to share this blog with others who may benefit from reading it.
Role of the Kidneys in Filtering Waste and Proteins
Welcome to our Florida Kidney Physicians (FKP) blog, where we aim to empower you with knowledge about your kidney health. We appreciate your willingness to learn about how the kidneys work—they are fascinating organs indeed! By taking a closer look at the complexities of kidney function, we hope you’ll feel appreciative of all your kidneys do to keep you healthy.
Our team at FKP understands that kidney-related issues can be challenging, but understanding the basics of kidney function and common complications like proteinuria is crucial for managing your health. In this blog post, we’ll explore the role of kidneys, their functions, and the significance of proteinuria in maintaining overall well-being. We’re glad you’re here, and we’re confident that your curiosity will be rewarded with insights that can transform your understanding of your kidneys.
How the Kidneys Work
Acquiring an understanding of where your kidneys are located in your body and how the microscopic structures within these organs work tirelessly to filter blood and remove waste will set you on the path toward fostering an awareness of the silent yet crucial processes that your kidneys perform minute after minute, hour after hour, day after day.
- Overview of Kidney Anatomy:
Polycystic Kidney Disease (PKD) Foundation shares this information regarding kidney anatomy: “They are located in the back of the body on each side of the spine, tucked under the rib cage. Each kidney is about five inches long (12 cm), three inches wide (8 cm), and two inches thick (5 cm) with each one weighing 10 to 12 ounces (280 to 340 grams).” Even though your kidneys are rather small, they are remarkably powerful. Most people are born with two kidneys, but it’s possible that you were born with only one. If necessary, your doctor can order an ultrasound to confirm the presence of two kidneys. - Nephrons and Filtration
The aforementioned PKD Foundation website states that “Each of your kidneys contains about one million tiny filters called nephrons. The nephrons are made of a tuft of thin blood vessels in a spherical structure called the glomerulus which is connected to a series of tubules.” Water, electrolytes, and other small substances must be processed by these microscopic structures so your blood can be filtered, metabolic waste removed, and a balance of fluids established. The kidney filtration and retention process produces urine, regulates your blood pressure, balances electrolytes, and even contributes to hormone production, red blood cell production, and calcium metabolism.
Basic Overview of Kidney Function
The healthier your kidneys, the better they will function. Here’s a basic overview of kidney function, which will allow you to further grasp how your kidneys operate within your body’s complex internal environment.
- Filtration Process
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) notes that “healthy kidneys filter about a half cup of blood every minute, removing wastes and extra water to make urine.” Remember those millions of nephrons we mentioned above? Each nephron includes a filter (the glomerulus) and a tubule; while the glomerulus filters your blood, the tubule helps re-deliver essential substances back into your bloodstream. NIDDK adds, “The thin walls of the glomerulus allow smaller molecules, wastes, and fluid—mostly water—to pass into the tubule. Larger molecules, such as proteins and blood cells, stay in the blood vessel. The tubule helps remove excess acid from the blood. The remaining fluid and wastes in the tubule become urine.” Imagine blood entering your kidneys and the glomeruli acting as an incredibly strict gatekeeper: only certain substances will be permitted to pass through, while important substances will be held back and then reabsorbed. Meanwhile, waste products are diverted and then excreted as urine. That cycle continues, and it’s a cycle that works best when undisturbed. - Regulation of Electrolytes
Your kidneys don’t just produce urine—they also help balance electrolytes, which are essential minerals that contribute to your body’s physiological processes. Examples of electrolytes include sodium, potassium, calcium, magnesium, chloride, phosphate, and bicarbonate; these minerals are essential for the proper functioning of your cells, nerves, and muscles. You receive electrolytes from the foods you eat and the beverages you drink, and your kidneys must selectively reabsorb or excrete these electrolytes so the electrolyte levels in your body stay within range.
Role of the Kidneys in Filtering Waste and Protein
It’s accurate to think of your kidneys as the most meticulous of filters. They filter wastes and substances in your blood so impressively that, if you could see them functioning firsthand, you’d be in awe.
- Waste Filtration
The kidneys act as a sophisticated filtration system by ensuring that waste products, toxins, and excess fluids are continuously removed from the bloodstream. Waste filtration is crucial because your body constantly generates waste as part of normal, everyday metabolic processes. These wastes need to be eliminated in order to prevent them from accumulating in your body. Accumulated waste products can harm your kidneys and lead to serious health complications, one of which is kidney failure. - Protein Retention
Your kidneys filter and eliminate wastes they encounter, but as for proteins? Essential proteins are meant to stay in your blood. By retaining essential proteins, your kidneys regulate your body’s protein balance; this keeps you healthy by ensuring that your blood consists of all the proteins and cells it needs to perform vital bodily processes.
Understanding Proteinuria
If you’ve recently been diagnosed with proteinuria, you may be wondering how and why your kidneys are permitting protein to leak into your urine. Allow us to provide valuable information on this condition, and why it’s a condition that must not be ignored.
- Defining Proteinuria
Proteinuria: the presence of excessive proteins in your urine. But why? How? It’s normal to have lots of questions following a proteinuria diagnosis. Proteinuria is a condition that indicates that something has gone awry with your kidneys; they’re not filtering properly, and it’s important for your doctor to promptly and accurately determine why. Healthy kidneys retain essential proteins and prevent those proteins from leaking into your urine. You may have an underlying health issue that needs to be addressed. Further testing will be required to identify the “whys” and the “hows” so your doctor can move forward with creating a treatment plan that will strive to protect your kidney function. - Significance of Proteinuria
When your doctor informs you that excess protein has been detected in your urine, don’t panic—instead, inquire about the next steps. Your doctor won’t let a proteinuria diagnosis be overlooked or disregarded because it could be an indicator that you have an underlying kidney issue that could cause health complications if left untreated. The sooner your doctor or nephrologist can determine why protein is leaking into your urine, the sooner an appropriate treatment plan can be created for you to follow.
Conclusion
Understanding how the kidneys function and their role in filtering waste and proteins is key to preserving your kidney health. This blog post highlighted nephrons and filtration, the intricate filtration process, regulation of electrolytes, waste filtration, and protein retention.
We hope you gained a better understanding of your kidneys and why they are considered vital organs.
By appreciating the intricate processes at play within your kidneys, you can be more proactive in maintaining a healthy lifestyle and promptly addressing any symptoms of concern. If you’re worried about your kidneys, talk to your doctor about blood tests, imaging studies, and other tests that can be ordered; the results of these types of tests can reveal how well your kidneys are functioning.
Stay tuned for more insights on kidney health from Florida Kidney Physicians; we believe patient education makes you feel empowered. The more you learn, the more you’ll feel equipped to ask questions, initiate conversations, and advocate for your kidney health in ways you might not have had you not taken the time to learn about kidney function and how the kidneys work.