Circulatory, lymphatic, heart

Question 1

what are portal systems?

Answer 1

specialised vascular channels that carry substances from one site to another, but don’t depend on central pump

Question 2

layers of blood vessels

Answer 2

intima, media and adventitia

Question 3

what is the intima made of?

Answer 3

lining layer of endothelium - sits on basal lamina

beneath basal lamina is a thin subendothelial layer of fibrocollagenous support tissue containing myotintimal cells

Question 4

what is endothelium?

Answer 4

lining layer of highly specialised multifunctional flattened epithelial cells called endothelium which sits on a basal lamina

Question 5

what are myointimal cells? where are they?

Answer 5

contractile cells with some properties of smooth muscle cells also capable of synthesising collagen and elastin and phagocytosis

important in atheroma

in fibrocollagenous support tissue in tunica intima

Question 6

what is the tunica media made up of?

Answer 6

smooth muscle reinforced by organised layers of elastic tissue - form elastic laminae

Question 7

where is the media prominent/less prominent?

Answer 7

prominent in arteries
indistinct in veins
non-existent in small vessels

Question 8

what are elastic arteries?

Answer 8

arteries close to the heart, receiving full thrust of systolic pressure wave

Question 9

what is the tunica adventitia made up of?

Answer 9

collagen

smooth muscle cells may be present, esp in veins