The nephron secretes potassium.
The Nephron's Role in Potassium Secretion
The nephron is the functional unit of the kidney and plays a vital role in maintaining electrolyte balance, including potassium. This process involves a combination of filtration, reabsorption, and secretion.
- Filtration: Potassium is initially filtered from the blood into the nephron.
- Reabsorption: The body reclaims a portion of the filtered potassium.
- Secretion: The nephron actively transports potassium from the blood into the urine.
Factors Influencing Potassium Secretion
Potassium excretion is carefully regulated, and the amount secreted can vary considerably based on several factors:
- Dietary K+ intake: Higher potassium intake generally leads to increased secretion.
- Aldosterone levels: This hormone promotes potassium secretion.
- Tubular flow rate: Increased flow enhances potassium secretion.
- Acid-base balance: Acidosis (increased acidity) tends to decrease potassium secretion, while alkalosis (increased alkalinity) increases it.
According to available information, potassium excretion can range from 1% to 110% of the filtered load, highlighting the nephron's dynamic ability to regulate potassium levels.
