Arkansas Esthetician Practice Exam 2026 – The Comprehensive All-in-One Guide to Master Your Certification!

The initial line of defense against infection is provided by immune cells. While keratinocytes do play a role in protecting the body from external threats, such as UV radiation and dehydration, they are not the first line of defense against infection. Tendons, which connect muscles to bones, and the stratum granulosum, which is a layer of skin, do not contribute to the body's defense system. It is important to note that other structures and processes such as mucus, saliva, and tears also provide initial defense mechanisms, but immune cells are primarily responsible for recognizing and destroying harmful pathogens.