What do mucus, saliva, and tears have in common?

Mucus saliva and tears act as the first line of defense against the antigen and act as physical barrier of the immune system. These barriers resist microbes to enter the body. Saliva and tears contain an enzyme called lysozyme which kills the invading bacteria by destroying their cell wall.

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all of the above

jomady. when the body perspires due to the temperature rising, trepidation, exercise, or a disease known as hyperhidrosis, then you would lose the sodium and potassium stored in your body, also known as the na+/k+-atpase enzyme.