Human Personality


Human personality is reflected in the way of behavior, daily activities and doing competitive works. Human personality can be classified into Type A, Type B and Type AB personalities according to researchers. Type A behavior (TAB) or personalities have something to do with being competitive and most of them are workaholics. Type B personalities on the other hand are generally patient, relaxed, easy-going . AB personalities have mixed profile and cannot be clearly categorized as either Type A or Type B.

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Why we are so Happy or Sad?


We have both Pleasure centre and Pain centre in the brain. When there is over stress, the pleasure centre will be in operative so that the normal enjoyable moments will not give any pleasure. In to our brain, millions of messages are passing  daily, of which some are happy messages and others, are sad messages. Brains cells communicate each other through the chemical messengers produced by them to make the body prepared to cope up with the situations. If the messages are happy, then the Endorphin system responsible for the happy mood will be elicited. The sad messages are also carried by the brain messengers which causes mood alteration and  loss feeling. Most nerve centers in the brain are capable of receiving both happy and sad messengers and as long as their input is balanced, everything runs normally.If a person is capable of using these happy messengers wisely, he feels that stress is challenging, fun and enjoyable.Don’t be anxious about the future, and don’t be too much ambitious . A person living in  the real world  will have pastpresent and future. But a person under stress will not have these . We know past, but we don’t know future. So it is better to live in present.

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Human Personality


Human personality is reflected in the way of behavior, daily activities and doing competitive works. Human personality can be classified into Type A, Type B and Type AB personalities according to researchers. Type A behavior (TAB) or personalities have something to do with being competitive and most of them are workaholics. Type B personalities on the other hand are generally patient, relaxed, easy-going . AB personalities have mixed profile and cannot be clearly categorized as either Type A or Type B.

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DNA Chip. How Stuff Works


Electronics is emerging as a new branch called Bionics in combination with biology since there are possibilities to explore the ideas from living organisms. Micro organisms are now considering as the major source for developing DNA chips, Molecular switch etc. This new field is the Synthetic biology.

The DNA chips opened a new era in medical research and medical diagnostics. The DNA chip can provide large quantity of genomic data of microorganisms in a few hours, so that identification of the microbe is very easy. A DNA chip is a” Micro array” of genes attached at fixed locations on a solid support like glass slide or silicon membrane.
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Stethoscope. How Stuff Works


Stethoscope is a medical diagnostic tool for Auscultation which is the listening of internal sounds of the body. Auscultation is used to examine the heart sounds, breath sounds, bowel sounds etc. Auscultation requires skill,  clinical experience and a good quality stethoscope. An experienced physician can distinguish normal Lub and Dub sounds of the heart as well as heart murmurs and gallops. In combination with the sphygmomanometer, the Stethoscope is used to measure the blood pressure. The Stethoscope was invented by Rene Laennec of France in 1816. The two-sided stethoscope was invented by Rappaport and Sprague in the early 20th century.

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Sphygmomanometer. How Stuff Works


The Sphygmomanometer is the diagnostic device used to measure the blood pressure. Blood pressure is the pressure exerted by the blood on the wall of the artery during its flow. It is meant for keeping constant blood flow throughout the body irrespective of the position. Normal blood pressure is 80 mmHg-120 mmHg in which 80 mmHg is the diastolic pressure when the heart relaxed and 120 mmHg is the systolic pressure when the heart contracts. The diastolic pressure up to 90 mmHg and systolic pressure up to 130 mmHg is treated as normal but the person is in the border line of Hypertension. Usually a BP index is used since the BP may vary slightly depending on the conditions of the body and either systolic or diastolic pressure may be high as in the case of aging. Even if we sit in front of the Physician, our BP may increase slightly due to nervousness, a condition called as “White coat effect”. BP index is calculated by adding systolic and diastolic pressures and then dividing by 2. In normal case it is 120+80 / 2 = 100. Up to 110 is treated as normal. BP measurement on both the arms and periodic measurement are advisable to confirm the Hypertension before going on medication.

Conventional Sphygmomanometer is mercury column based and has an inflatable cuff to restrict the blood flow. It is used in conjunction with Stethoscope to hear the sound during the measurement. Sphygmomanometer was invented by Samuel Siegfried Karl Ritter von Basch in 1881.

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MRI Scanner. How stuff works


MRI Scanner is the Medical Imaging device used to image the soft parts of the body especially the Brain. Magnetic Resonance Imaging or MRI is the technique used in MRI scanner to provide the detailed structure of the brain. Unlike CT (Computed Tomography) scanning, MRI uses no ionizing radiation but uses powerful magnetic field to align the nuclear magnetization of hydrogen atoms in the water content of the body. Diseased tissue, such as tumors, can be detected because the protons in different tissues return to their equilibrium state at different rates. By changing the parameters on the scanner ,this effect is used to create contrast between different types of body tissue.Patients with some metal implants, cochlear implants, and cardiac pacemakers are prevented from having an MRI scan due to effects of the strong magnetic field and powerful radio frequency pulses.

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