The blood-brain barrier separates the vascular system from the brain and is formed by endothelial cells which are enclosing the

In mammals the olfactory mucous membrane is located in the upper part of the nose, called the nasal roof. In

The air-blood barrier is a structure present in the lungs that controls gas exchange by means of pressure and concentration

The skin is the body’s largest organ and protects the body against diseases caused by organisms, toxic chemicals, and mechanical

The immune system recognizes both self and non-self-entities. When non-self agents are recognized, like nanoparticles, immune cells decide whether they

Our gastro-intestinal tract is highly specialised for the uptake of different materials (food), their digestion, and the delivery of the

Nanoparticles that are present in the body (i.e. after injection) are largely taken up and eliminated by the so called

The placenta is an important tissue barrier that separates the unborn child from the mother. The foetus is totally dependent