blood vessles Flashcards
what 5 blood vessles is blood transported round the body in
arteries, veins, capillaries, arteriols and venules
what is the order of the 5 blood vessels
arteries, arteriols, capillaries, venules, veins
what is the role of the arteries
to carry oxygenated blood at high pressure away from the heart through the aorta.
what are characteristics if the arteries
has lumen, large muscle surrounding artery muscle, robust, elastic, high blood pressure, no valves
what do arterioles provide
a link between arteries and capillaries
how do arterioles work
the same way as arteries
what is there just before arteriole becomes a capillary
there is a ring of muscle called a pre - capillary sphincter
what is the role of the veins
to carry deoxygenated blood back to the heart from all over the body
what are the characteristics of the veins
contain blood under low pressure which contains waste products, thinner tunica media than arteries, larger lumen, have valves to prevent backflow of blood, pass through muscle
what do venules collect
blood from the capillaries and connect to the veins with low blood pressure
what is the role of the capillaries
small blood vessels that link the arteries to the veins and allows oxygen and carbon dioxide to pass through the walls
what are the characteristics of the capillaries
one cell thick, allow gas exchange, semi - permeable structure of tissues
what is the study of blood
haematoloy
how much blood do mot adults have
4 - 6L
how much plasma do most adults have
55%
how much white blood cells and platelets do most adults have
41%
how much red blood cells do most adults have
45%
what are the roles of the red blood cells
contains haemogoblin which bounds oxygen and to send haemogoblin around the body
what is the roles of the platelets
swarm to damaged areas of the body to minimise bleeding
what is the role of the plasma
fluid that enables cells to flow around the body also able to carry carbon dioxide, protein, glycogen and fats
what is the role of the white blood cells
circulate around the body looking for foreign bodies to attack and destroy
