Third trimester. It doubles in mass at this time and continues to still grow and mature
Answer:
they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.
The walls of the alveoli are only one cell thick. This makes the exchange surface very thin - shortening the diffusion distance across which gases have to move. Each alveolus is surrounded by blood capillaries which ensure a good blood supply.Adaptations of the alveoli:
Thin walls - alveolar walls are one cell thick providing gases with a short diffusion distance. Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls - allow gases to pass through.
Explanation:
Have great day
ions are electrically charged particles formed when atoms lose or gain electrons
Null hypothesis<span> are never accepted. We either </span>reject<span> them or fail to </span>reject<span> them. The distinction between “acceptance” and “failure to </span>reject<span>” is best understood in terms of confidence intervals. Failing to </span>reject<span> a </span>hypothesis means<span> a confidence interval contains a value of “no difference”.
Hope this helps. </span>
