A characteristic common to both diffusion and active transport is that
(1) enzymes are required
(2) oxygen is moved across a membrane
(3) ATP is needed
(4) the movement of molecules occurs
Answer and Explanation: Diffusion is the movement of molecules from the region of higher to the region of lower concentration. Diffusion occurs passively, which means that there is no energy input in order to make the molecules move. A...
Gall bladder stores bile. Bile is released into duodenum (first part of small intestine) to help with fat digestion and absorption.
How does bile work? Bile is composed of salts, which are ionic compounds. Fats are nonpolar molecules that clump up together in the polar environment of the duodenum. Therefore, we need something to separate them and allow for the digestive enzymes to get to work. And that's what bile salts...
Have you ever noticed "goose bumps" or the hair on your arms "standing up" ? When does it happen and why?
If you pay close attention, you would see that we get goose bumps when it is chilly. Therefore, this has to be a mechanism to regulate our body temperature and warm us up. Does it happen only in humans? Not at all! This mechanism of keeping warm is common to many mammals.