3. Tissue Fluid Flashcards
What are the 2 ends of the capillary known as ?
Arterial end - nearest artery.
Veinous end - nearest vein.
Arterial end
High hydrostatic pressure
Less negative water potential
Oxygenated blood
Veinous end
Low hydrostatic pressure
More negative water potential
Deoxygenated blood
Why at Arterial end is there high hydrostatic pressure ?
Due to contractions from the left ventricle which push blood out of the heart at high pressure
And narrowing of vessel
So what happens at the arterial end with the high hydrostatic pressure ?
Plasma is forced out of capillary into the surrounding tissue.
Plasma then baths the tissue leading to formation of tissue fluid.
The plasma which leaves contains oxygen/ nutrients / water- pressure filtration as red blood cells / big proteins don’t leave capillaries as too large.
What happens at the veinous end?
More negative water potential because the capillary lost lots of water so in turn there is more solutes in capillary with remaining water.
95% of plasma fluid reabsorbed back into veinous end - along with waste substances like co2 and urea.
This ^ occurs by osmosis as there is a more negative water potential in capillary compared to tissue fluid.
What happens to the 5% of plasma that didn’t get reabsorbed ?
It gets absorbed by the lymphatic capillary and moved about lymphatic system.
Moved around by contractions of skeletal muscle.
Put back into main circulation later on.
what happens to lymph when you’re paralysed / not moving v
Gravitate towards lower body.
What is fluid called in capillary ? Tissues surrounding capillary and in the lymphatic system ?
Capillary - plasma fluid
Tissues - tissue fluid
Lympathic - lymph
What happens to your body when you don’t consume enough protein?
Less protein / amino acids in blood.
Water potential at veinous end of capillary is less negative.
Meaning not as much tissue fluid reabsorbed back into capillary.
Distended tummies due to build up of tissue fluid
