Active Transport Active transport is the?movement of molecules and ions through a cell membrane from a region of lower concentration to a region of higher concentration Active transport?requires en...
Diffusion & Facilitated Diffusion Diffusion is a type of?transport?that can occur?across a cell membrane Note that diffusion can also happen within a cellular compartment; the presence of a mem...
Practical: Investigating Membrane Structure & Permeability The?permeability?of?cell membranes?is affected by several?factors?such as Temperature pH The effect of such factors on membrane struct...
Cell Membranes Membranes?are vital structures found in all cells The?cell surface membrane?creates an enclosed space separating the internal cell environment from the external environment, and?intr...
The Mammalian Lung: Structure & Function The?lungs?of air-breathing animals provide an ideal exchange surface for the diffusion of gases The lungs are located in the?thorax, or?chest cavity Som...
Fick's Law of Diffusion Fick's Law relates the rate of diffusion to the concentration gradient, the diffusion distance and the surface area This relationship can be represented by the following equ...
Properties of Gas Exchange Surfaces All organisms need to?exchange gases with their environment,?e.g. Aerobic?respiration?requires oxygen and produces carbon dioxide as a waste product Photosynthes...
1.2.11 Practical: Vitamin C Content Vitamin C is found in green vegetables, fruits, and potatoes It is essential for a healthy diet The chemical name for vitamin C is?ascorbic acid Ascorbic acid is...
Lipids & CVD A?risk factor?is any factor that?increases the chance?of developing a particular condition or disease An increase in a risk factor does not guarantee the development of disease, bu...
