THere are many barriers to prevent foreign organisms and viruses from entering your body. These include the skin, the mucous membranes of the respiratory system, the stomach acid, the enzymes in your tears, and the immune system.
skin.
immune
immune system
A firewall is used to filter out information that is aggressive or what is perceived to be unsuitable. A firewall also acts as a barrier to the ingress of viruses and Trojans.
Yes, dentin is a layer of connective tissue that acts as a barrier to protect the pulp.
True. The skin acts as a barrier against germs and also controls body temperature.
skin acts as a natural barrier against harmful stuff :) So do tears, sweat and the stomach :)
Skin
It acts like a shield, so micro organisms aren't able to pass through unless there is damage to the skin. (e.g. A cut.)
saliva, mucus, hairs and Skin
To hold the cell together. It acts as a barrier
Skin.
The cell membrane.