When movement occurs against the concentration gradient (low to high), this requires Active Transport.
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Substances moving against the concentration gradient, from a lower concentration area to a higher concentration area requires an active transport. It is termed as “active” since there is a requirement of energy usage. This process is in contrast with that of a passive transport. Active transport needs carrier proteins for assistance.
Both active transport and facilitated diffusion requires proteins for assistance in transport process. The difference is that, active transport always takes place against the concentration gradient, thereby moving the substances from lower concentration area to a higher concentration area. The types of proteins that are used for transport will not be same.
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Human impact on the ecosystem is something done by humans and gives the affect at the ecosystem like chopping down forests,and cars burning off greenhouse gases.Humans can effect the ecosystem in a negative way ,by pollution, waste dumping, over hunting of animals,over fishing,industrial gases,energy use
Answer: The lungs are well supplied with blood due to lots of capillaries covering the alveoli, constantly maintaining a large diffusion gradient, air is able to pass easily down this gradient due to the alveoli having very thin walls (one cell thick).
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The alveoli are adapted to make gas exchange in lungs happen easily and efficiently. Here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick)
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