Health Psychology Block 2 Review

Health Psychology Block 2 Review - Health Psychology Block...

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Health Psychology Block 2 Review Stroke, Heart Attacks, and Voodoo Death Chronic stress activates the SNS and the stress hormones (epi and norepi catecholamines) Results in chronic activation of HR and BP (increase) causes an increased blood flow Bifurcation o The body’s cardiovascular system works like a machine o It’s components consist of large and small parts that carefully fir together so that it can nourish large organs and small cells How the heart works o Blood enters through the right atrium then the right ventricle it then travels to the lungs to become oxygenated o Blood then travels back to the heart through the left atrium, down to the left ventricle and out into the body The sino-atrial (SA node) is located at the top of the right atrium and generates electrical impulse which causes the atria to contract The heart fibers are all interconnected and are referred to as the syncyticum o When one fiber becomes excited, the AP spreads to all of the fibers o Inflow of Na and Ca and cells become depolarized The function of the circulatory system is to transport blood which carries oxygen and nutrients and remove waste from tissue o Arteries carry blood from the heart to the body o Veins return the blood to the heart o Capillaries connect arterial and venous systems How does the SNS direct blood to active muscles, heart, and brain away from the digestive system?\ o The vagas nerve decreases SNS activity by decreasing the inflow of Na and Ca. o This process can block AP’s o The vagas nerve is the longest of the cranial nerves Why stress paves the way for CHD? o Chronic activation of the CVS, puts excessive pressure and turbulence at sites of bifurcation o This results in damage within the smooth lining of vessels Epinephrine o Makes platelets stickier and fatty acids and glucose deposit themselves in the tears and pits within the vessel walls Atherosclerosis o This results in a build up of plaques that form within vessels o When the vessels become completely blocked, heart tissue looses its oxygen and nutrients and tissues begin to die o In addition, the heart cannon operate without BF and get blood to other important areas of the body (e.g. brain) Controllable Risk Factors o Hypertension o Tobacco use o Lack of physical activity o Poor nutrition Behavioral risk factors for CVD among US adults o Type A personality Competitive, hurried, hostile people who may be at increased risk for developing CVD o Type B personality More relaxed people who are not pressured by time considerations and tend to be CVD resistant What is the difference between an ischemic stroke and a hemorrhagic stroke? o Ischemic stroke Sometimes plaque dismembers from a worn part of a vessel and begins to travel in the direction of the brain Damage results when the plaque gets stuck in a smaller vessel within the brain
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