Doctors often break down low blood pressure (hypotension) into categories, depending on the causes and other factors. Some types of low blood pressure include: Low blood pressure on standing up (orthostatic, or postural, hypotension). This is a sudden drop in blood pressure when you stand up from a sitting position or after lying down.
The dermis is the middle layer of skin. It is a diverse combination of blood vessels, nerves, hair follicles and sebaceous (or oil) glands. The proteins collagen and elastin are found in the dermis. They provide support and elasticity to the skin. The sun's rays can break down these proteins and, eventually, the skin begins to wrinkle and sag.
The epidermis or outer layer is the active growing layer of the skin, which provides a tough outer layer of cells that protect us .It does not contain blood vessels and is nourished by a process called diffusion, in which fluid coming from the blood vessels in the next lower layer, the dermis. Source(s):ust to point out, you asked which part of the DERMIS does not contain any blood vessels. The epidermis is avascular as the answers above have mentioned, but the epidermis is not part of the dermis. The dermis and epidermis are two separate and distinct parts of the skin.