Biomedical engineering is relatively a new branch of engineering which is slowly emerging as a mainstream engineering branch due to the growth in the health consciousness of human kind. The main motto of a biomedical engineer is to keep the people healthy and giving due attention to their illness during diagnosis and cure. Some of the biomedical instruments which are extensively used nowadays are electrocardiogram (ECG) for heart related diagnosis and cure, electroencephalogram (EEG) for brain related diagnosis and cure, electromyogram (EMG) for muscle related diagnosis and cure and electroretinogram (ERG) for eye related diagnosis and cure. A human body consists of electrical, mechanical, thermal, hydraulic, pneumatic and chemical systems which are good at communication with each other internally and externally. The main physiological systems of a human body are biochemical system, cardiovascular system, respiratory system and nervous system. Biochemical system is an integrated system which produces energy for the body activation. This system also gives energy to messenger agents for the communication of material which facilitates body repair and growth. Cardiovascular system is a complex system which consists of a closed hydraulic system with a four-chamber pump (which is nothing but the heart) connected to flexible elastic tubes (which are nothing but the blood vessels). Respiratory system is a pneumatic system. Nervous system is acting as the communication network.
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