Guaifenesin is an expectorant. It works by thinning and loosening mucus in the airways, clearing congestion, and making breathing easier. Phenylephrine is a decongestant (sympathomimetic). It reduces nasal congestion by narrowing the blood vessels in the nose.luids will help to break up mucus and clear congestion. If you are using the liquid form of this medication, carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.
A root barrier is essentially an underground wall that keeps plants and hardscapes from conflicting. There are two types of root barriers: mechanical and chemical. Chemical barriers work by stopping the growth of the tree root when it reaches the barrier, by killing the tree roots that come into contact with it.
A plants stem is like a supportive tube; it brings the water and nutrients that is sucked up by the roots to the plant, and it supports it.also, the stem has the abilty to gr â¦ ow taller/shrink in order to get more light.+ 103 others found this useful. John Bulan. plant's epidermis is primarily used for protective purposes, which it does by acting as a barrier to invaders (such as fungi).