So I cut my finger with a knife and was wondering, when a vessel gets chopped clean, I believe the side that flows out gets clotted up so you don’t internally bleed. But how do both ends reconnect? Especially if they’re dangling around and no longer aligned. Or do they just… not?? But then wouldn’t that decrease blood flow
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Red blood cells help create collagen, which are tough, white fibers that form the foundation for new tissue. The wound starts to fill in with new tissue, called granulation tissue. New skin begins to form over this tissue.
Although there’s a big difference between a cut and actually being lopped off. In the latter, alignment is taken into consideration when reattaching, as misalignment can result in permanently damaging nerve connections.
New blood vessels can form throughout your life. This process is called angiogenesis. [This article](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6608066/) about the relationship between angiogenesis and wounds, says this in its introduction:
>As adult skin wounds heal, a period of rapid and robust capillary growth creates a vascular bed that has many fold more capillaries than does normal tissue.
Basically, a bunch of new capillaries grow into the tissue. This is a useful process because the wounded tissue needs a bunch of new nutrients in order to power the healing process. (Actually, the article discusses how it might actually be an excessive response for most cuts. But it is the body’s response.)
But eventually these capillaries are no longer needed. As a result:
>Over time, most of the newly formed capillaries regress, resulting in a final vascular density similar to that of normal skin. …
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>After the growth of blood vessels into the wounds, a period of vascular pruning occurs. Over time, most of the newly formed vessels regress until eventually the density of blood vessels returns to that of normal, uninjured skin. The regression process is carefully regulated and includes the selective apoptosis of many of the recently formed capillaries, followed by maturation of the remaining ones.
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