Unit 3 - Tissue fluid Flashcards
What is lymph?
Modified tissue fluid that is collected in the lymph system
What is tissue fluid?
A liquid produced from the circulatory system which contains dissolved nutrients
What is the function of tissue fluid?
- Transports substances to the tissues and returns waste products of the cells back to the circulatory system
- bathes cells which protects cells
- allows the cells to take up the products needed
Give 3 examples of substances found dissolved in tissue fluid
Glucose
Amino Acids
Oxygen
Carbon Dioxide
What is the lymphatic system?
- system that contains drainage vessel for excess tissue fluid
- fluid in vessels known as lymphatic fluid
What are the functions of lymph nodes?
Involved in immune response and contain lymphocytes
What happens to excess tissue fluid?
Drains into lymph vessels
Some tissue fluid returns to capillaries
What is the function of pores in capillaries?
- allows tissue fluid to leave capillaries
- do not allow blood cells or large proteins out of the blood
What is hydrostatic pressure?
The pressure created by water in an enclosed system
What is oncotic pressure?
The pressure caused by the tendency of water to move into blood by osmosis as a result of plasma proteins
Why does hydrostatic pressure fall as blood and tissue fluid move through the capillaries?
-due to increased distance from the heart and branching of the arterioles into many capillaries
Why does oncotic pressure stay the same throughout the capillaries?
The plasma proteins in the blood which generate the pressure are too large to fit through capillary pores
Why does tissue fluid move in and out of capillaries?
Due to opposing blood pressures
In what direction does tissue fluid move at the arteriole end of the capillary?
Out of the capillary
Why is tissue fluid forced out of the capillary at the arteriole end?
- The Hydrostatic pressure is greater than the oncotic pressure so tissue fluid is forced out of the blood
- down a pressure gradient
