Structure and function of arteries and veins.
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The document compares and contrasts the key features of arteries, veins, and capillaries. Arteries carry oxygenated blood away from the heart at high pressure, have thick muscular walls, and a relatively narrow lumen. Veins carry deoxygenated blood back to the heart at low pressure, have thinner walls that can collapse, and larger lumens. Capillaries have the thinnest walls of only one cell layer and the smallest lumens, connecting arteries and veins to supply tissues with nutrients and oxygen and remove waste.
Structure and function of arteries and veins.
- 1. t::k•rte»ry outer wall • small lumen . thick layer of muscles · and elasticfibres Avein thin layer of muscle and elastic fibers fairly thin outer wall A~plllary very small lumen wall made of a single layer of cell Sections through the three types of blood vessels
- 2. Arteries caoillaries 'Veins II Fil!lnction Carry :~ood away -Supply all cells with their Return !btoodlto l!he h~art at low from the heart at hiq h require,n-ients [Pll!55Ur l! press1Jr@ -Take away wc1, te products SUUclure of waH -l t1h:-k~ w-ong 1 v~r-y Ehin~only one cell •Thill ...c-0111:ain l!llusct"s.. thick ~ MeInly fibmu~ tissue, elaslir.: iflbras e1nd -Contain far It"..... n11u:scle and r~hru11,!:,,~ssue t!I~'.".• i(: tis-sue than erterles, Lun1en -N,irr,,w I ....y ie.__..f'I/ H r~fl OW Wid1~· ..varieswiLtl heartbeat ..Ju~ wtde ertough for a red ([nCrti'-nSe=s lli II llwtIA bloodceHto pass through o·f blood passes I through) II Yalvu (-) (-) (+) Prevent back:naIN- - tkliw s1·rurture -Snn(lt.11 and ,elastldty ~ Na na'&d for strolillg walls, .. No ne&d for ·drOl!'IG wnlli5, as fjrts 1unmon needed to withstand BS mast orlhe bioad most of tthe· blood pres,,gure has the pu~slng of the twes:sure ha,s beeti lost been ~ost blocd, preven.t bursttF1 g -Thin wat!s and na:rrow .,. Wide lumen offers less andl maintain pressure rtumen br~ng ~oad Into close re·sislan<:f" to !blood flow wave -contactwith body tissue, -H@rps, to maf:ntain a.41ow:lng diUusion of high blood pressure,,. matwal:s between capnla.-y prevenung blood and surroundrng tis.5ues. Howing backwan::ls -White b~ood c,ells can -squee,ze bet:we.en cells of thew.all
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- 4. -.""'ll"'t - · - ---~ ~~y~-~ - .... - ' .. .J• ·"~. - . .- ,c . . - ~ Arledea ,· < • I - -- - . ~- I.) Moves towanls.the heart.. l) M.oves a·wa.1,. rmm the heart. ' 2) Collects blood (mm body organs. 2) Dlstributes brood to the body· organs.. 'r . 3) Blood pressure inveins .ls low. 3) Blood p,ressure is high in arteries. 4) Valves are p.rescent 4) ·vaives are absent.- - .5) Carryd~al-ed blood. except 5) ,Carry oxygenated blood ueept pulmonary vein. pulmonary artery. 6) V.ns start In blood c:aplllarles. 6) Arteries end .in caplLlarles.. '7) They can,be seen subcutaneously. 7) They are deep ~~ 8) They coilapse when there t.s.no 8) They do not coUapse when there is oo blood la II or cut across~ blood ·In lt.. 9) Yelm aR: lurther divided mtovenules.. 9) Arteries arefmther divided blto- arterioles.. - 10) Veins are·usually Danened or 10) 1bey are round and reLatjvely th'lck -collapsed With thin walls. walled~ I I) VeJns have large hntten°' 11) Arte_rlet have small lumen. 12) Veln1 u. bluls!h ln-c,olour. 12) .Arteries are reddJsh Sn eotour+ 13) Vans show sluggish movement ,of 13) Arteries show.spurty ~ent blood. . of blood girvillll pulse, .. 14) Hvenouswal is tnjuNd, blood 14) II arterla1 walll ls lnjured. the blood comes out, collecrs 1na pool ln a 1, comes-•out Hke afountain in a large·II I Stttall area around vein. area all around theartery.