8.3 Blood, Tissue Flhid And Lymph Flashcards Preview

8. Transport In Animals > 8.3 Blood, Tissue Flhid And Lymph > Flashcards

Flashcards in 8.3 Blood, Tissue Flhid And Lymph Deck (10)
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What does the blood plasma contain

Dissolved glucose
Amino acids
Mineral ions
Large plasma proteins
Red blood cells
White blood cells


What are platelets

Fragments of large cells called megakaryocytes found in the red bone marrow
Involved in the clotting mechanism of the blood


What does the blood transport

Oxygen and co2 from respiring cells
Digested food from small intestine
Nitrogenous waste products
Chemical messages (hormones)
Platelets to damaged areas
Cells and antibodies for immune response


What is oncotic pressure

The tendency of water to move Into the blood by osmosis
About -3.3kPa


What is hydrostatic pressure

When blood flows through the arterioles into the capillaries it’s still under pressure from the surge of blood that occurs every time the heart contracts


What is tissue fluid

Fluid that fills the spaces between the cells
It has the same composition as plasma without red blood cells and plasma proteins


How does the hydrostatic pressure change in tissue fluid

At the arterial end of the capillary hydrostatic pressure that forces fluid out of the capillaries is relatively Hugh at 4.6kPa
This is higher than the oncotic pressure attracting water in so fluid I squeezed out of the capillaries
As blood moves through the capillaries the hydrostatic pressure falls to 2.3kPa as the fluid has moved out and the heart beat pulse is lost
Now the oncotic pressure is higher as it stayed the same at -3.3kPa, meaning water moves back unto the capillaries as it approaches venous end


What is lymph

The tissue fluid that doesn’t return back to the capillaries
The liquid that leaves the blood vessels drains into a system of blindended tubes called lymph capillaries
It has less oxygen and nutrients to plasma and tissue fluid
Contains fatty acids


What do the lymph capillaries do

Join up to form large vessels and the lymph is transported through them by the squeezing of body muscles and valves
They eventually return to the blood


What are along the lymph vessel and what do they contain

Lymph nodes that have lymphocytes built up in them when necessary that produce antibodies
They intercept bacteria that are ingested by phagocytes found in the nodes