Fluid Balance

Question 1

What are the two main fluids of the body?

Answer 1

Extracellular fluid which baths cells acting as a medium for constant exchange of nutrients and water products between capillaries and cells

Intracellular fluid which is 60% of all
Body fluids - found within cells

Question 2

What is ECF made up of ?

Answer 2

Interstitial fluid- found outside cells

Intravascular fluid- blood plasma

Question 3

What is the risk of overhydration?

Answer 3

Too much water in the body may lead to nausea, anorexia, vomiting, confusion, cardiac failure

Question 4

What damage can under hydration cause?

Answer 4

Thirst, dry skin, low BP, coma

Question 5

How is blood volume determined?

Answer 5

Blood volume is determined by the amount of water and sodium ingested

Question 6

How does RAAS work?

Answer 6

When blood volume is low specialised cells in the kidney secrets renin
Renin causes angiotensin which is produced by the liver to convert to angiotensin 1
Angiotensin 1 travels in the circulation to the lungs where it is converted to angiotensin 2
Angiotensin 2 causes vasoconstriction to increase peripheral resistance
Stimulates secretion of aldosterone
Aldosterone acts on kidneys to decrease production of urine