Answer:
They are small because they are small
Explanation:
They want to be small because they are small
Im pretty sure that its tissue......not the one you blow your nose in lol. Hope this helps
Answer:
Blood flow to the liver is unique in that it receives both oxygenated and (partially) deoxygenated blood. As a result, the partial gas pressure of oxygen (pO2) and perfusion pressure of portal blood are lower than in other organs of the body.