Renal Physl 16 Flashcards
What can cause blood volume and osmolarity to both increase?
Salty food being consumed more than liquid
What is comparable to intake of a hypertonic solution?
Eating salty foods more than water intake
How does a hypertonic solution affect ECF and osmolarity?
ECF volume and osmolarity increase
How is the urine affected by increased ECF and osmolarity?
A hypertonic urine is produced where sodium and water are excreted
What will cause blood volume to increase but plasma osmolarity to remain normal?
The salt and water ingested is the same osmolarity of the plasma so only volume is expanded
What kind of urine is produced if blood volume is increased and plasma osmolarity is normal?
Isotonic urine is produced
What would cause blood volume to increase and osmolarity to decrease?
Ingesting pure water
What would happen to the ECF if blood volume is increased and osmolarity is decreased by ingesting pure water?
ECF is diluted
What kind of urine would be produced if Blood volume is increased and osmolarity decreases?
A large volume of dilute hypotonic urine
What may be stimulated if plasma osmolarity dips to low?
Salt apatite
What may cause blood volume to remain unchanged but plasma osmolarity to increase?
Consuming solutes in the absence of fluid intake
What kind of urine is produced if blood volume is unchanged but plasma osmolarity is increased?
Small volume of concentrated urine
What triggers the thirst mechanism?
When blood volume is unchanged but plasma osmolarity increases
What may cause blood volume to be unchanged but plasma osmolarity to be decreased?
A dehydrated person who only ingests pure water
How do unchanged blood volume and decreased plasma osmolarity affect the ECF?
It causes ECF to be diluted
What was the idea behind gatorade?
When exercising people lose water and salt so gatorade contains fluid and electrolytes to replenish that without diluting ECF
What can cause a reduced blood volume and increased osmolarity?
Diarrhea or excessive sweating where more water is lost than solute
Whos is most susceptible to reduced blood volume and increased osmolarity?
Elderly people and babies
What may cause a reduced blood volume but an unchanged osmolarity?
A hemorrhage
What is the treatment for reduced blood volume and unchanged osmolarity?
Blood transfusion or isotonic saline infusion
What is the goal in response to dehydration?
To restore blood pressure, extracellular fluid volume and plasma osmolarity by conserving fluid and preventing losses
What is the main way to restore BP, ECF volume and plasma osmolarity in dehydration?
Conserving fluid and prevent loss by rapid cardiovascular reflexes and thirst
How are blood volume, pressure and osmolarity affected by dehydration?
Blood volume and blood pressure decrease and plasma osmolarity increases
How does the reduced BP and blood volume seen in dehydration affect carotid and aortic baroreceptors?
Reduced stretch of baroreceptors causes them to relay information to the cardiovascular control centers in the brain