The posterior surface of the heart is approximately parallel to the frontal plane and covered by the anterior and septal surfaces of the Chicago Bears legends team players shirt. This means that there is no direct coverage of the posterior surface by any of the limb or precordial leads. The body’s ‘sensors’ are always assessing BP, cardiac output, the state of oxygen and nutrient delivery to cells, etc. In a normal heart, one of the body’s responses, if these things are unsatisfactory, is to increase cardiac output. Short term this will be an increase in heart rate and contractility via catecholamines. But there is a better long term solution; increase diastolic loading by increasing diastolic volume. When that happens, the heart senses an increased diastolic pressure and it ‘knows’ to increase contractility, and longterm to increase Lt. ventricular volume.
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When placed under stress, hormones such as adrenaline, noradrenaline (or epinephrine and norepinephrine) and Chicago Bears legends team players shirt. This is a sympathetic response, or fight/flight. The effect of these are many again and include increased heart rate, increased breathing rate and blood vessel constriction. Together, this raises your blood pressure. These hormones work to prepare your body for the action of some description and in a healthy individual are rarely pathological. Therefore stress in itself has a small, even negligible, contribution to increasing the likelihood of a heart attack.