A Level Biology Revision "Non-specific Defences Against Pathogens"

Описание: You can find all my A Level Biology videos fully indexed at https://www.freesciencelessons.co.uk/...

In this video, we start looking at the body's non-specific defences against pathogens. These include the skin, mucous membranes, lysozyme and expulsive reflexes. In the next video, we look at blood clotting and inflammation.

Image credits:

Human Skin Structure
https://commons.wikimedia.org/wiki/Fi...
XenonR, CC BY 3.0 https://creativecommons.org/licenses/...

Tear
https://commons.wikimedia.org/wiki/Fi...
NessaLand, CC BY 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Scab
https://commons.wikimedia.org/wiki/Fi...
Jpbarrass, Public domain, via Wikimedia Commons

Sebaceous gland
https://commons.wikimedia.org/wiki/Fi...
OpenStax College, CC BY 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Epidermis and dermis
https://commons.wikimedia.org/wiki/Fi...
Normal_Epidermis_and_Dermis_with_Intradermal_Nevus_10x.JPG: Kilbadderivative work: Fama Clamosa, Public domain, via Wikimedia Commons

Lining of treachea
https://commons.wikimedia.org/wiki/Fi...
Magscope, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Gastric mucosa
https://commons.wikimedia.org/wiki/Fi...
Nephron, CC BY-SA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Sneeze
https://commons.wikimedia.org/wiki/Fi...
James Gathany, Public domain, via Wikimedia Commons

Coughing
https://commons.wikimedia.org/wiki/Fi...
https://upload.wikimedia.org/wikipedi...