I think it might be proteins
I would love to help answer, but i think i need a little more context here.
<span>To create a seal on an unresponsive person’s face using a ventilation mask, lift the Person's jaw into the mask.
The upper part of our head has a larger diameter compared to our jaw.
So, when putting a ventilation mask for an unresponsive person, it would be faster and easier if we enter the mask from the jaw.</span>
I cant see the last question and i guess it’s all upon you too