AS Unit 1 Biology Module 1 structure of the blood

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The structure of blood
Blood and tissue fluid
Blood is a liquid held in our vessels.
It consists of blood cells in a watery fluid-plasma
Plasma contains many dissolved substances ie
co2, salts, glucose, fatty acids, hormones and
plasma proteins , red blood cells (enrythrocytes),
various white blood cells (leucocytes) and
fragments called platelets
Tissue fluid
is very similar to blood:
-doesn't contain most of the cells found in blood
-no plasma proteins
Role: transport o2/nutrience from cell & carry
co2/other waste products to the blood
Formation of tissue fluid
When an artery reaches to the tissue, it branches
into smaller arterioles, then into the network of
capillaries
These eventually link up with venules to carry blood back to the veins
So blood flowing into an organ or tissue is contained in the capillaries
At the atrial end of a capillary, the blood is under high pressure due to the contractions of the
heart muscles
This is also known as hydrostatic pressure
Tends to push the blood fluid out of the capillaries and the fluid leaves out of the capillaries
Fluid leaves the blood= consists of plasma with dissolved nutriences/o2
At RBC=platelets

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