Kidney Function and Filtration
Kidney function and filtration refer to the essential roles kidneys play in maintaining the body’s internal balance. The kidneys filter blood to remove waste products, excess water, and toxins, forming urine for excretion. They also regulate electrolyte levels, blood pressure, and pH balance. This filtration process occurs in tiny units called nephrons, ensuring the body retains necessary substances while eliminating harmful ones, thereby supporting overall health and homeostasis.
Kidney Function and Filtration
Kidney function and filtration refer to the essential roles kidneys play in maintaining the body’s internal balance. The kidneys filter blood to remove waste products, excess water, and toxins, forming urine for excretion. They also regulate electrolyte levels, blood pressure, and pH balance. This filtration process occurs in tiny units called nephrons, ensuring the body retains necessary substances while eliminating harmful ones, thereby supporting overall health and homeostasis.
💡 Key Takeaways
- Understand how the kidneys filter blood through the glomerulus and form urine.
- Learn how the nephron reabsorbs water, electrolytes, and nutrients while secreting wastes.
- Explore how the kidneys regulate fluid balance, electrolyte levels, and acid-base balance.
- Identify common tests to assess kidney function (e.g., GFR, creatinine) and basic ways to support kidney health.
❓ Frequently Asked Questions
What is the primary function of the kidneys?
To filter blood, remove wastes and extra fluids, regulate electrolytes and acid-base balance, and help control blood pressure and red blood cell production.
What is glomerular filtration?
The process by which water and small solutes pass from blood in the glomerulus into the renal tubules, forming filtrate that becomes urine.
What does GFR measure?
Glomerular filtration rate measures how much filtrate the kidneys form each minute; normal is about 90–120 mL/min.
How do the kidneys regulate fluid and acid-base balance?
They reabsorb or secrete electrolytes and water along the tubules, adjusting Na+, K+, bicarbonate, and hydrogen ion levels to keep body fluids and pH stable.