 |
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
||||||||||||
 |
 |
 |
 |
 |
|
||||||||
 |
 |
 |
|
||||||||||
 |
 |
|
|||||||||||
 |
|
||||||||||||
 |
 |
 |
 |
|
|||||||||
 |
 |
|
|||||||||||
 |
 |
 |
|
||||||||||
 |
 |
 |
 |
|
|||||||||
Chapter 17. Regulation of body sodium and body water
Previous Chapter Next Chapter Self-Assessment for this chapter
Keypoints
- Body osmolality is controlled by regulating body water content
- Body volume is controlled by regulating body sodium content
- Body water content is altered by changes in thirst and renal water excretion
- Body sodium content is altered by changes in renal sodium excretion
- Body osmolality is detected by osmoreceptors in the hypothalamus
- Body volume is detected by stretch receptors mainly in the circulation
- Osmoreceptors influence ADH release ADH enhances renal water reabsorption
- Many factors influence renal sodium excretion, especially the renin-angiotensin II-aldosterone system which promotes sodium reabsorption
- Osmolality will usually be regulated even if this means that body volume will be altered from normal.
- The main exceptions to this rule arise if the regulatory mechanisms are themselves disordered
Self-Assessment Questions for this Chapter