pericadium
Surfactant
The sun dries and cracks them open
The device placed inside blood vessels to keep them open is called a stent.
A product of the lung tissues called surfactant keeps the tiny alveoli open.
They are safe as long as the chemicals stay inside the plastic cover. Do not open or cut the glow sticks keep the chemicals inside where they can not be ingested.
That is correct. Alveoli only contain only two types of cells: Type I cells that are like thin sheets and make up the actually wall of the alveoli, and Type II cells that secrete a substance called surfactant that helps to hold the alveoli open. There can also be some macrophages present in the alveoli to destroy invading bacteria.
This is not true as surfactant, which helps to keep the lungs open and prevents the alveoli from sticking together, is not formed until 37 weeks gestation.
The lock mechanism is broken. Can you keep it lock from inside the car?
If it doesn't stay open by itself, the two spring-loaded rods inside the top of the truck area are faulty or disconnected.
Try checking for a child lock. If it's on, it'll keep the door from being able to be opened from the inside. Happens in our car all the time.
Inside
tarp or plywood are the answers i have gotten so far
The larynx or voice box provides a passage. but the alveoli help