The plasma membrane must possess mechanisms for getting nutrients into the cell. Nutrients such as oxygen and hydrogen are needed in relatively large amounts and are referred to as macro-elements.
Plasma membrane is the layer that surrounds the cell surface. It is made up of a lipid bilayer along with proteins, carbohydrates and cholesterol embedded in the bilayer. The membrane protects the cell from outer environment and regulates the traffic of substances passing across the membrane.
Macro-elements are those elements that are required in high quantities by the cell. These are essential for the proper functioning of the organism and prevent the diseases. The various macro-elements are: chloride, calcium, phosphorous, magnesium, sodium, etc.
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