| Term | Definition |
|---|
| Thin descending section | Part of the loop of Henle that is involved in the reabsorption of water |
| Thick ascending section | Part of the loop of Henle that reabsorbes solutes such as sodium and potassium |
| Loop of Henle | Reabsorption here helps to determine the concentration of urine |
| Reabsorption in the DCT/CD | Controlled mostly by an antidiuretic hormone (ADH) and aldosterone (ALD) |
| Aldosterone | Hormone secreted by the adrenal cortex in response to low BP; increases reabsorption of mainly ions and then water; blood volume increase - bp increases; urine is more concentrated due to absence of water |
| Antidiuretic hormone | Produced by the hypothalamus and secreted by the pituitary gland in response to low BP; inserts water channels into the cells and causes water to be reabsorbed into the blood; blood volume increase - bp increases; urine becomes very concentrated |
| ADH not present | Factors include: 1. In response to high blood pressure 2. Principle cells don't have water channels; impermeable 3. Urine concentration: very diluted |
| Obligatory water reabsorption | A type of water reabsorption in which water movement depends on ion movement |
| Facultative water reabsorption | Another type of water reabsorption that is due to hormones (i.e. ALD and ADH) |
| Secretion | When excess materials and waste move from the blood into the renal tubule |
| K+ secretion | Mostly secreted in the collecting duct due to extremely high blood potassium levels; aldosterone cause sodium and water reabsorption and potassium secretion |
| K+ imbalance | Effects that include arrythmia and cardiac problems |
| H+ secretion | Because normal pH levels are around 7.35-7.45, the pH of our diet tends to be acidic - intercalated cells in the DCT; will secrete excess H+ ions into the renal tubule |
| Ammonia/Urea | A toxic waste product of protein metabolism; quickly converted into urea and quickly crosses filtration membrane; excess remaining in blood will be secreted |
Combine with other sets
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