Understanding the Human Nervous System: Roles and Functions

INTRODUCTION NERVOUS SYSTEM
The?nervous system?is the part of human body that coordinates the voluntary and involuntary actions of the human and transmits signals between different parts of its body.?The nervous system is our processing system, and the system that keeps us in contact with the outside world. It tells us that we exist, and along with the muscles allows us to move and react to stimuli. Our consciousness resides in our nervous systems, as do our thoughts and emotions. In short, the roles of the nervous system are: responsible for coordination of movement, response to environmental stimuli, intelligence, self-awareness, thought, and emotion. Nervous system is composed of nerve cells called neurons, which are specialized to carry

There are multiple ways that a cell can send signals to other cells. One is by releasing chemicals called?hormones?into the internal circulation, so that they can diffuse to distant sites. In contrast to this "broadcast" mode of signaling, the nervous system provides "point-to-point" signals neurons project their axons to specific target areas and make synaptic connections with specific target cells.?Thus, neural signaling is capable of a much higher level of specificity than hormonal signaling. It is also much faster: the fastest nerve signals travel at speeds that exceed 100 meters per

ash was boiled for 5 minute with 25ml distilled water by covering the crucible with a watch-glass on water bath then cooled. The watch-glass was rinsed with 5 ml of distilled water and this liquid was added in to the crucible. The % of remaining content was deducted from initial % of ash taken (i.e. 100%) to determine the water soluble ash value.
Foaming Index
About 1 gm. coarse powder was weighted and transferred to a 500 ml conical flask containing 100 ml of water. It was maintained at moderate boiling for 30 minute on water bath. It was cool and filtered in to a 100 ml volumetric flask. Volume was diluted by adding sufficient amount of water. The decoction was poured in test tube, and then shaken in a lengthwise motion for 15 seconds. They were allowed stand for 15 minutes and the height of foam was measured to determine the foaming index.
6.3.3. Phytochemical Analysis of Crude Extract (Khandelwal, 2005, Kokate, 2006)
The crude extract obtained by solvent extraction was subjected to various qualitative tests to detect the presence of common chemical constituents as:
Alkaloids, Glycosides, Carbohydrates, Phytosterols, Saponins, Tannins, Flavonoids Proteins