The epidermis.
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EPIDERMIS
dermis. The dermis contains a network of blood vessels that supply oxygen and nutrients to the epidermis, which lacks its own blood supply. This nourishment is essential for the growth, repair, and maintenance of the skin cells in the epidermis. Additionally, the dermal blood vessels help regulate temperature and support the overall health of the skin.
Cartilage is avascular, meaning no blood supply. This is why cartilage is so long to heal and most often irreplaceable if damaged severely enough. The epidermis and subcutaneous connective tissues are vascular.
Vascular in this sense refers to blood supply. Your epidermis is avascular, which means it has no blood supply of it's own. Because arteries and veins run throughout your dermis, the dermis as a whole is considered a vascular region.
It has its own arteries and capillaries. In other words, it has a circulatory system just like every other part of the body.
The heart muscle that has its own supply of blood from vessels is called the myocardium. It receives its blood supply primarily through the coronary arteries, which branch off from the aorta. This blood supply is crucial for delivering oxygen and nutrients to the heart muscle, enabling it to function effectively.
the process through which the tumor supports its growth by creating its own blood supply is called angiogenesis
The medical term for tissues without their own blood supply is avascular tissue. These tissues rely on diffusion to obtain nutrients and oxygen from nearby blood vessels. Examples include cartilage and cornea.
That has never come in to question as you cant "reserve" your own blood. Blood banks are open
The coronary arteries because they supply fresh blood to the heart's own muscle. The heart stops pumping if its muscle wall doesn't get enough blood. The coronary arteries are what supply blood to the heart itself and they are pretty small and narrow- they can't handle even a small clot.