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    • #2485
      Edher
      Participant

      Saludos,

      I have a small curious doubt. How porous are veins and arteries?

      In other words, do veins and arteries exchange a lot of chemicals before their arrival to capillary beds, or does the exchange all take place in the capillaries?

      Thank You,
      Edher

    • #32704
      MrMistery
      Participant

      the wall of capillaries is unistratified, so the vast majority of exchanges take place here.

    • #32742
      Leesa
      Participant

      Capillaries are semipermeable which means things pass through them, therefore all nutrients and gas exchange takes place in the capillaries, before transfering it to the cells.

    • #32748
      sdekivit
      Participant
      quote MrMistery:

      the wall of capillaries is unistratified, so the vast majority of exchanges take place here.

      and there are also cappilairies that are fenestrated –> increased permeability for example in the kidneys.

    • #33326
      Anonymous
      Participant

      Are vein walls more muscular than arteries’?

    • #33327
      Anonymous
      Participant

      Do veins have valves on the inside to prevent backflow?

    • #33331
      MrMistery
      Participant

      @jerry
      Yes
      @SciNtist
      Arteries have more muscle fibres than veins…

    • #33490
      Dr.Stein
      Participant

      Then my question: why arteries are muscular whereas veins are not so? 😉

    • #33518
      Poison
      Participant

      blood comes to arteries with high pressure, so they are muscular to avoid the pressure affect negatively.

    • #33531
      MrMistery
      Participant

      Ozge is right. Arteries are accumulators of pressure, so they need muscle fibers. Veins are accumulators of volume so they need to be able to expand.

      By the way, Dr.Stein, was this a test or sth like that? 🙂

    • #33559
      Dr.Stein
      Participant

      This was a little quiz like the one that I regularly give to my students in the end of my class or before my next class to provide their comprehension of things they already got from my previous lecture 😉

    • #34416
      Bio-Hazard
      Participant

      What causes veins to form into strong arteries when used for a tripple bypass?

      Also, when training the cardiovascular system, would the veins become more muscular over time?

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