If it has valves then it is a vein.
Answer:
That’s an interesting question
Explanation:
Huh let’s think???
D. Polarity and size.
<span>The size, polarity, and charge of a substance will determine whether or not the substance can cross the cell membrane by diffusion. The cholesterol was an example of a lipid, and is highly soluble in the nonpolar environment of the lipid bilayer. You saw, in the animation above, the cholesterol freely passing into the hydrophobic environment of the membrane. Cholesterol distributes freely in the membrane and then some fraction will dissolve in the aqueous environment of the cytoplasm. Water, on the other hand, while polar, is small enough to cross the membrane at a slow rate. Note that specialized transport proteins in certain cell membranes can provide a channel for the water, greatly increasing its rate of crossing the membrane. The lipid bilayer is much less permeable to the ion, because of its charge and larger size. As a general rule, charged molecules are much less permeable to the lipid bilayer.</span>
When the patient with emphysema was
selected lung values changed (from those of the normal patient) in the
spirogram are:
ERV, IRV, RV, FVC, FEV1, FEV1 %
<span>The reason behind the changes of these values are due to the loss or inability of electric recoil. A spirogram (graph
like structure obtained by the respiratory movements) is measured by
spirometer.</span>
