Characteristics of Tissue Fluid and Capillaries

Tissue fluid

extracellular fluid

How is tissue fluid formed?

Formed by pressure filtration of plasma in capillaries

What reinforces the formation of tissue fluid?

High pressure in arteries

Where is the tissue fluid located/ Where does it move to?

Comes out of pores and moves between cells of surrounding tissues

What is the effect of tissue fluid coming out of the pores?

It speeds up the rate of exchange between tissues and blood

What is tissue fluid similar to? (In terms of its composition)

blood plasma (except it doesn’t have blood cells)

What is included in tissue fluid?

It contains oxygen, glucose, water, and other small substances

What does the tissue fluid not contain?

large proteins and red blood cells since they are too large to fit out of the pores and stay in blood

What are the adaptations of capillaries? (6)

-very small (<10 μm) and branched

-large surface area for exchange

-have pores (fenestrations)

-made with 1 layer of endothelium cells

-lined with a basement membrane protein gel (acts as a filter allowing small and medium sized substances to move)

-slow moving fluid allows wastes and CO₂ to enter from tissues (helped by low pressure in small veins or venules)

What is the size of capillaries and its structure?

very small (<10 μm) and branched

Describe the surface area of capillaries?

large surface area for exchange

Do capillaries have pores or fenestrations?

Yes

Describe the layer(s) of capillaries

1 layer (1 cell thick) of endothelium cells

What are capillaries lined with and what is the function of the lining?

Lined with a basement membrane protein gel; acts a filter allowing only small and medium sized substances to move

What is the effect of slow moving fluid of capillaries?

Allows wastes and CO₂ to enter from tissues

What reinforces the entering of waste and CO₂ into capillaries?

helped by low pressure in small veins/venules