Blood vessels

In which direction do arteries carry blood

• Into the heart

• Away from the heart

• In and out of the heart

Arteries always carry oxygenated blood

• True

• False

What is the name of the artery that carries deoxygenated blood

Vasoconstriction and vasodilation occur to control what?

• Blood pressure

• Blood volume

• Both blood volume and blood pressure

Elastic tissue in arteries is used to

• Control blood pressure as it allows the artery to stretch as small volumes of blood, under high pressure pass through it and prevents any increase in blood pressure

• Control blood pressure as it allows the artery to stretch as large volumes of blood, under high pressure pass through it and prevents any increase in blood pressure

• Control blood pressure as it allows the artery to stretch as large volumes of blood, under low pressure pass through it and prevents any increase in blood pressure

Arteries have small lumens compared to veins, why?

• So they can carry small amounts of blood

• So they can carry large volumes of blood

• So they can maintain high blood pressure as the amount of blood decreases ensuring blood gets to the cells quickly

• So they can maintain low blood pressure as the amount of blood decreases ensuring blood gets to the cells quickly

Arteries have a smooth, seamless endothelium to prevent friction which increases blood pressure

• True

• False

Arteries get smaller in lumen and wall thickness as they get further away from the heart because

• They need to be small to enter organs

• The amount of blood pressure decreases the further way they get so thick walls are not needed

• They are going to turn into capillaries so need to get much smaller

• All of the above are true

Capillaries are only one cell thick because

• They need to be thin to allow for diffusion of material

• They need to reach every cell in the body so must be microscopic

• They don't have blood passing through them under high pressure so don't need thick walls

• All of the above

Capillaries are highly branched because

• They need to reach nearly every cell in the body

• They need to reach nearly every cell in the body and need blood pressure to increase so there is enough time for the exchange of materials

• They need to reach nearly every cell in the body and need blood pressure to slow down so there is enough time for the exchange of materials