Formation of Lymph Flashcards
Is blood in arteries under higher pressure or lower pressure than blood in veins?
It is under higher pressure than blood in veins
As the blood in arteries is under higher pressure than that in veins what does this cause to happen?
This causes some fluid and small proteins to be forced out of blood plasma in capillaries arising from arterioles.
The fluid and small proteins forced out of blood plasma in capillaries arising from arterioles due to blood pressure is known as what?
Tissue fluid
What does tissue fluid surround?
It surrounds all the cells of the body
How does tissue fluid differ from plasma?
It does not have red blood cells or platelets and has smaller amounts of white blood cells and proteins
How does tissue fluid act as an exchange medium?
Materials entering or leaving cells pass through it
Is tissue fluid formed continuously?
Tissue fluid is formed continuously
What is the rat eat which tissue fluid is formed?
About one litre per hour is produced
As tissue fluid is formed continuously, what must be done to avoid swelling?
It must be removed and returned to the blood
As tissue fluid is removed and returned to the blood, what does this prevent?
It prevents swelling (called oedema) from developing in the tissues.
How many ways can tissue fluid be drained?
It can be drained by two routes
Explain the two routes of draining tissue fluid.
- Most (90%) of it is drawn back into plasma in the capillaries near the veins. This occurs by osmosis and is helped by the reduced pressure in the veins.
- About 10% of the fluid enters dead-ending tubes called lymph vessels. Lymph contains large amounts of white blood cells, proteins and fats.
Most (90%) of it is drawn back into plasma in the capillaries near the veins.
How does this occur?
What aids this process?
This occurs by osmosis and is helped by the reduced pressure in the veins.
What does lymph contain large amounts of?
Lymph contains large amounts of white blood cells, proteins and fats.
