The first heart sound is generally longer and lower than the second, producing a heartbeat that sounds like lub-dup, lub-dup, lub-dup. Blood pressure, the pressure exerted on the walls of blood vessels by the flowing blood, also varies during different phases of the cardiac cycle. Blood pressure in the arteries is higher during systole, when the ventricles are contracting, and lower during diastole, as the blood ejected during systole moves

An interesting view of the immune system with particular implications for the current review and collation of information is provided by the field of computer science. The immune system makes many series of continual trade-offs, distributing resources in a way that necessarily leaves certain vulnerabilities in the system as a whole while providing greater comprehensiveness in coverage and protection when necessary (Hofmeyr 1997). This makes the immune system an adaptive

Human Respiratory System The drive to breathe is involuntary and generally automatic, although one can change breathing patterns, and they change when we sleep or are doing different activities. The lungs and respiratory system function to move air 24/7/365 because the body cannot 'store' oxygen that it needs for cellular respiration and energy production. Thus air is constantly flowing in and out of the lungs (Healthline Editorial Team). Respiration, in terms of

Leading The leadership style at McDonald's relies on the three legs of the stool. For the most part, the innovation and vision part of the leadership process is with McDonald's head office, while the more autocratic style comes through the suppliers and the owner/operators, whose job it is to undertake the actions that will allow the company to implement strategy. The company has its own leadership school that helps to ensure

But argument and criticism carried on across the boundaries of two or more different sets of fundamental assumptions may not intersect sufficiently for discourse to be productive, or even meaningful. Systematic improvement of intellectual performance, justification and criticism of knowledge claims, must proceed from a foundation of known, though not necessarily shared, basic assumptions. Conclusions are inseparable from the assumptions and reasoning on which they depend. Further, even if agreement

Immune System and Stress How quickly a deceased human (or animal) body breaks down is testament to how well the immune system works. While a body is alive, the immune system protects the body at every living moment from bacteria and other foreign invaders. The immune system is a complex system of cells -- which have varying functions -- and generated at discreet regions of the body, a circulatory system --