ELI5
Googles not doing it. Blood is carried through our veins but it’s also all over at once like when cut happens and that’s what give us our warmth, colour, nutrients etc. all over
I’m having trouble understanding how this blood is “all over” evenly spread.
The question is do we have free blood that not in veins and arteries? It’s seeming to me like we do???
How does blood “pool” and swell like a foot or a hand but not enlarge the veins and arteries if that’s where it’s carried?
Am I confusing myself?
EDIT!!! Y’all made that made that make so much more sense. So do capalaries end at where your pores begin? Like why you have blood in a popped pimple?
In: Biology
Hello! I’ll try to give a rough ELI5 background of all this. Hope it helps.
A core detail of your circulatory system is that it has roughly four components, your heart which helps move blood around, arteries that carry blood away from your heart, capillaries which are very thin and more penetrable tubes, and veins which carry blood back towards your heart. Its as if you have a few large and very strong rivers, each of which progressively branch out into tiny rivers that deposit and pick up things, then merge back together to large rivers returning to the source (your heart). Each beat of your heart supplies the push and pull to keep it all moving. You also have two general loops going on here, with one going through your lungs, where these capillaries will pick up oxygen from your lung tissue, return to the heart, then go down the other loop to deliver it to the rest of your body, before returning and going back through your lungs once again.
Now, your blood actually has a lot of different components to it, and it carries all kinds of things that need to move around your body: oxygen, nutrients, hormone signals, water, and so on. At capillaries and the like, these can be exchanged through the walls–if the nearby tissue is very low in something (like oxygen, for exerted muscle tissue for example), it can be diffused into this tissue from your blood. If it’s very high in the nearby tissue (like carbon dioxide, waste, etc), it can be picked up by your blood and passed along elsewhere.
To further complicate it, you also have other local fluids and the like that assist in this relay of resources and different things, and signals that can change the characteristics of your circulatory system walls–for example, they can constrict, enlarge/relax, or be made more permeable. Different cells can also pass through them, in addition to resources and other things nearby.
If capillaries are damaged and the like, you can have small amounts of local bleeding (seen as bruising, often). Other more serious wounds can also cause internal bleeding and pooling. However there’s also cases where damage triggers a large influx of immune-related cells or fluid buildup (if something is going on, it’s deemed helpful to do this).
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