It circulates from the heart through the arteries to the capillaries to the veins and back to the heart
When the blood moves away from the heart
epithelial cells
endothelium
Elastic fibres
smooth muscle with more elastic fibres
Stretch and recoil
vasoconstriction
vasodilation
Exchange of substances with tossue througj their thin walls
outer layer of connective tissue containing elastic fibres
thinner
prevent the backflow of blood
Plasma to pass through the capillary walla into the tossue fluid surrounding the cells
blood plasma with the exception of plasma proteins
they are too large to be filtered through the capillary walls
glucose, oxygen and other substances
diffuse out of the cells and into the tissue fluid to be excreted
the blood
thin walled lymphatic vessels
circulatory system