3.1.2 TISSUE FLUID

Question 1

Formation of tissue fluid steps

Answer 1

Blood enters capillary under high hydrostatic pressure (arterial end) from the heart
Fluid from capillary forced out into space around tissue through pores
Large plasma protein and red blood cells remain in capillaries (too big) so oncotic pressure in capillary increase
Fluid from tissue exits via osmosis back into capillaries at low hydrostatic pressure in venule end
Excess fluid in tissue is drained by lymph vessels

Question 2

What is found in the tissue fluid

Answer 2

Little WBC
Little small proteins
Water
Dissolved solutes

Question 3

What is contained in the lymph

Answer 3

White blood cells
Antibodies
Water
Solutes

Question 4

Hydrostatic pressure at different areas

Answer 4

In blood plasma: high
In tissue fluid: low
In lymph: low

Question 5

Oncotic pressure at different areas

Answer 5

In blood plasma: more negative
In tissue fluid: less negative
In lymph: less negative

Question 6

What is in the blood plasma

Answer 6

Rbc
WBC
Water (dissolved solutes)
Plasma proteins
O2
CO2
Urea

Question 7

Filtration pressure

Answer 7

Hydrostatic pressure - oncotic pressure