Blood, Tissue Fluid and Lymph
- Created by: Eleanor Izzard
- Created on: 21-12-12 13:49
View mindmap
- Blood, Tissue Fluid & Lymph
- Blood
- consists of a watery fluid called plasma - containing many dissolved substances (O2, CO2, salts, plasma proteins, glucose etc)
- contains red blood cells (erythrocytes) and white blood cells (leucocytes) and platelets
- Tissue Fluid
- transports oxygen and nutrients from the blood to the cells and CO2 and waste products to the blood
- artery reaches tissues and branches into smaller arterioles, then into a network of capillaries
- blood under high pressure due to contraction of the heart - hydrostatic pressure
- tends to push the blood out of the capillaries through tiny holes in their walls
- the fluid that leaves consists of plasma with dissolved nutrients and oxygen and occasionally a few white blood cells
- everything else is too large to pass through the holes
- fluid surrounds the cells so that gaseous exchange can occur across cell surface membranes
- tissue fluid has some hydrostatic pressure which will tend to push the fluid back into the capillaries
- both the blood and the fluid also contain solutes, giving them a negative water potential - the tissue fluids is less negative than the bloods
- water moves back into the blood via osmosis
- at the other end of the capillaries, the blood reaches venules (that lead to veins)
- here the blood has lost its hydrostatic pressure - combined with the hydrostatic pressure in the tissue fluid and the osmotic force of the plasma proteins fluid moves back into the capillary
- it carries dissolved substances such as CO2
- here the blood has lost its hydrostatic pressure - combined with the hydrostatic pressure in the tissue fluid and the osmotic force of the plasma proteins fluid moves back into the capillary
- at the other end of the capillaries, the blood reaches venules (that lead to veins)
- water moves back into the blood via osmosis
- both the blood and the fluid also contain solutes, giving them a negative water potential - the tissue fluids is less negative than the bloods
- tissue fluid has some hydrostatic pressure which will tend to push the fluid back into the capillaries
- fluid surrounds the cells so that gaseous exchange can occur across cell surface membranes
- everything else is too large to pass through the holes
- the fluid that leaves consists of plasma with dissolved nutrients and oxygen and occasionally a few white blood cells
- tends to push the blood out of the capillaries through tiny holes in their walls
- blood under high pressure due to contraction of the heart - hydrostatic pressure
- Lymph
- the tissue fluid that doesn't return to the capillaries is drained away into the lymphatic system
- it is drained via tubes similar to capillaries from the tissues to the blood system in the chest cavity
- contains same solutes as tissue fluid - less O2/nutrients, more CO2/waste
- more fatty material that has been absorbed from the intestines
- contains many lymphocytes, produced in the lymph nodes that are swellings found at intervals along the system, that filter any bacteria and foreign material from the lymph fluid
- phagocytes can then engulf and destroy these bacteria and foreign particles
- the tissue fluid that doesn't return to the capillaries is drained away into the lymphatic system
- Blood
Similar Biology resources:
Teacher recommended
Comments
No comments have yet been made