The epidermis.
EPIDERMIS
The subcutaneous layer.
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.
The epidermis does not have its own blood supply; instead, it relies on diffusion from the underlying dermis for nutrients and oxygen. Specifically, the outermost layer of the epidermis, known as the stratum corneum, is avascular and consists of dead keratinized cells that provide a protective barrier. The lack of blood vessels in the epidermis is essential for its function, as it allows for effective barrier formation without interfering with the skin's protective role.
The cuticle of the skin is a transparent layer, so it does not have a color of its own. The color we see in our skin comes from the underlying layers of the epidermis, blood vessels, and melanin pigments.
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.
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.
mosqitoes
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