Why mucous membrane is always taken, cut away from mutilated cows? It is tissue that can survive without blood vessels. This must tell us something about the alien agenda: Genetic engineering. Epithelial tissue contains no blood vessels and is therefore dependent on the underlying basement membrane on the exchange of oxygen, nutrients and waste. Epithelium contains very fast-dividing cells (strong mitotoxic tissue). The functions of epithelial tissue are; protection, absorption, filtration, excretion, secretion and sensory therapy.