Unit 3, tissue fluid formation and absorbtion

Question 1

How is tissue fluid formed?

Answer 1

• capillaries are thin and have small gaps in the walls where liquid and small molecules are forced out
• as blood enters capillaries from atreioles there is a high hydrostatic pressure, so tissue fluid is forced out called ultrafiltration
  -happens at the ateriole end

Question 1

What is tissue fluid?

Answer 1

• fluid contains water, glucose, amino acids, fatty acids, ions and oxygen
• it bathes and surrounds the tissue
  This is how cells get molecules needed for respiration

Question 2

What is ultrafiltration?

Answer 2

When tissue fluid is forced out of capillaries due to high hydrostatic pressure.

Question 3

What molecules remain in capillary and don’t go into the fluid?

Answer 3

• red blood cells
• plateletes
• large proteins

Question 4

How is the tissue fluid re-absorbed?

Answer 4

• due to the large molecules still in the capillaries, there is a lower water potential and a lower hydrostatic pressure due to loss of liquid
  -water re-enters capillary by osmosis

Question 5

What would happen if there wasn’t re- absorbtion of tissue fluid?

Answer 5

There would be a higher potential outside of the cells, so the cells would burst and swell due to osmosis

Question 6

What end of capillary is fluid re-absorbed?

Answer 6

Venule end

Question 7

Where does co2 and urea absorb into ?

Answer 7

Into the water that is absorbed back into capillary

Question 8

What do the lymph vessels have?

Answer 8

Veins

Question 9

What is the lymphatic system used for ?

Answer 9

The tissue fluid that is not absorbed, is absorbed into the lymphatic system and is drained back into bloodstream near the heart