... of bones. Hydroxyapatite is brittle but rigid, thus giving bones a lot of strength; the composite of bones is both flexible and strong. If a hydroxyapatite crystal breaks since of stress and a crack starts to form in ... of HCl and other gastric secretions everyday, creating a very acidic solution inside the stomach. The concentration of HCl in this solution is about 10 millimolar, which is the equivalent of pH ... water-soluble, work like detergents, dispersing the large drops of fat into a fine emulsion of smaller droplets. The process of emulsification produces a greater surface area ...

• Word Count: 9019
• Approx Pages: 36
• Has Bibliography
• Grade Level: Undergraduate

... is selectively permeable, which means that only certain substances may pass through the membrane. Cell membranes consist mainly of phospholipids. These phospholipids have two parts; a polar phosphate "head" and two nonpolar fatty acid "tails." These molecules are arranged in a way that is known as a bilayer' (or double layer) so that the polar heads face ... means that the particles move further from the concentrated area, resulting in fewer within a particular space. Another form of diffusion is known as facilitated diffusion'. This process uses a carrier, generally in the form of a pro...

• Word Count: 1290
• Approx Pages: 5
• Has Bibliography
• Grade Level: Undergraduate