  In traditional engines (not overhead cam), the camshaft pushes lifters UP. Lifters push the pushrods UP, but the valves need to be pushed DOWN... so the rocker arm rock â¦ s on a shaft that pushes one side down when the other side goes up. It's not a difficult job.Rocker arms aren't doing the most stressful job in the engine, but they do eventually wear out.ifters push the pushrods UP, but the valves need to be pushed DOWN... so the rocker arm rock â¦ s on a shaft that pushes one side down when the other side goes up. It's not a difficult job. Rocker arms aren't doing the most stressful job in the engine, but they do eventually wear out.
1 These nerve cells are found in a tiny patch of tissue high up in the nose, and they connect directly to the brain.  Gustatory (taste nerve) cells are clustered in the taste buds of the mouth and throat. They react to food or drink mixed with saliva. Many of the small bumps that can be seen on the tongue contain taste buds. These surface cells send taste information to nearby nerve fibers, which send messages to the brain.
Taste sensation work with smell sensation or they enhance each other. The receptors for taste are located in specialized organs called taste buds which are numerous on the surface of the epithelium covering the tongue in humans and mamals.The taste buds are also located on the papillae on the upper surface of the tongue and also on the roof of the oral cavity, the pharynx and larynx. Olfactory receptors in the nose: chemoreceptors. - Taste receptors on the tongue: chemoreceptors. - Skin receptors: tactile, mechano, thermo, nociceptors. 2. Visceroreceptors: sensory receptors that produce sensations from organs or internal tissues. - Sensations include pain, hunger, thirst, fatigue or nausea.