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    As above.
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    (Original post by Questioness)
    As above.
    Mainly it's because arterioles are responsible in controlling the volume of blood flowing into the capillaries which is important in regulating temperature.

    I'm sure you know about all about this, vasodilation to allow more blood to flow through the dermal capillaries for increased heat loss, and vice versa for vasoconstriction.

    Have arterioles lined with smooth muscle allows control over the diameter of their lumen for thermoregulation.
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    It also comes into play to regulate the amount of blood flowing to other organs.
    For instance, when there's serious blood loss, the arterioles can contract to reduce the amount of blood loss at the wounded organ and it also allows more blood to be diverted to the brain and heart for increased survival.

    On the other hand, arteries don't need to control the amount of blood flowing as much as arterioles need to. Since they originate from the heart and don't deliver directly to the target organ, they will be carrying a high volume of blood and only work to make sure this is transported quickly. That's why they have elastin in their walls as its easier than having smooth muscle. Otherwise the brain will have to keep contracting and relaxing every systole and diastole; yes it's unconscious but its a wasteful process...
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    It's like how motorways are only interested in getting you from A to B quickly. They want to keep the cars going and they'll open up the hard shoulder if needs be. But when you start reaching roundabouts and diverging roads, traffic lights come into play to control the amount of cars reaching each destination.

    What's the use of putting traffic lights on a motorway? Cars can only go straight, why stop em.
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    (Original post by RMNDK)
    Mainly it's because arterioles are responsible in controlling the volume of blood flowing into the capillaries which is important in regulating temperature.

    I'm sure you know about all about this, vasodilation to allow more blood to flow through the dermal capillaries for increased heat loss, and vice versa for vasoconstriction.

    Have arterioles lined with smooth muscle allows control over the diameter of their lumen for thermoregulation.
    Spoiler:
    Show
    It also comes into play to regulate the amount of blood flowing to other organs.
    For instance, when there's serious blood loss, the arterioles can contract to reduce the amount of blood loss at the wounded organ and it also allows more blood to be diverted to the brain and heart for increased survival.
    On the other hand, arteries don't need to control the amount of blood flowing as much as arterioles need to. Since they originate from the heart and don't deliver directly to the target organ, they will be carrying a high volume of blood and only work to make sure this is transported quickly. That's why they have elastin in their walls as its easier than having smooth muscle. Otherwise the brain will have to keep contracting and relaxing every systole and diastole; yes it's unconscious but its a wasteful process...
    Spoiler:
    Show
    It's like how motorways are only interested in getting you from A to B quickly. They want to keep the cars going and they'll open up the hard shoulder if needs be. But when you start reaching roundabouts and diverging roads, traffic lights come into play to control the amount of cars reaching each destination.

    What's the use of putting traffic lights on a motorway? Cars can only go straight, why stop em.
    Thanks, you explained this really well. Makes a lot more sense now
 
 
 
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