1.7 Formation of Tissue Fluid and Lymph Flashcards
What do capillaries allow?
Capillaries allow materials to pass in ad out of the cells.
What is hydrostatic pressure?
When water in the plasma is forced out of the cells by the pressure of the heart’s contraction, taking with it dissolved nutrients and oxygen from the oxyhemoglobin in the red cells.
Example of blood protein that cannot pass through the basement membrane?
Albumin.
Why must tissue fluid return to the circulatory system?
Otherwise, our bodies would swell with the accumulating tissue fluid which is a condition known as oedema.
How is tissue fluid returned?
Tissue fluid is returned mostly to the capillaries through a process called osmosis.
What is osmosis?
The movement of water through a semi-permeable membrane from a less concentrated solution to a more concentrated one.
What is osmotic pressure?
As plasma is forced out by the hydrostatic pressure, more water surrounds the tissues , creating an imbalance, resulting in water being drawn back into the capillaries by osmosis due, in particular, to the presence of albumin in the capillaries.
What happens as water returns to the capillaries?
As water returns to the capillaries it take with it dissolved carbon dioxide and other waste products.
What is the lymphatic system?
A transport system that drains into lymph capillaries, which lead to lymph vessels.
What is the structure of of the lymphatic system?
This transport system is one way , leading from the lymph capillaries in the tissues through the lymph vessels to join the circulatory system at the top of the chest. There, the lymph drains into the main veins leading from the arms to the superior vena cava.
What are the purposes the lymphatic system serves?
- Maintains the correct blood volume.
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