Answer:
Molecules which move against the concentration gradient across the cell membrane employ the mechanism of active transportation.
Explanation:
Normally, permitted molecules moves across the cell membrane of the cell by the process of diffusion and osmosis. This is used when molecules move from hypertonic region to hypotonic region (if ions) and hypotonic to hypertonic (if water). This is a passive transportation which do not require the expense of energy from the cell.
In contrast, when molecules move in or out of the cell against their concentration gradient, that is ions moving from hypotonic region to hypertonic region, they implore the expense of energy in form of adenosine triphosphate (ATP), and the involvement of the membrane carrier proteins. This is called active transport.
False!
Neve cells send messages from your brain and to your brain.
That's why you feel pain, etc
Arteries are part of the circulatory system in the human
body that transports nutrients and oxygen to every cell of the body. It is also
a vessel that carries blood away from the heart and toward other organs and
tissues. If the smooth muscles in the arteries will be relaxed it decreases the
blood pressure.
Vitamin A because of the nutrient value per serving is 40% (the highest).
