Writing Assignment due Sept 3.

agespecgraph

Above: Incidence of heart attack hospitalization by age group in Oregon

Writing Project:

Heart attacks (myocardial infarctions) are more common in men than women, and the incidence increases dramatically with age. During heart attacks, plaque on a coronary artery wall can rupture, causing fibrin deposition, platelet aggregation and thrombus (clot) formation that obstructs the flow of blood. The resulting deprivation of blood flow and oxygen kills cardiomyocytes (muscle cells of the heart), predisposing to life-threatening changes in heart rhythm. These electrical disturbances impair the heart’s pumping ability and cause blood movement to cease, resulting in death.

Question 1. Is the above a proximate or ultimate explanation of heart attacks?

Question 2. Are there evolutionary theories of aging that help explain the link between age and heart attacks seen in the graph above?

Readings

1. Kirkwood Austad Nature 2000

2. Age-old-question

3. Williams. Pleiotropy, Natural Selection, and the Evolution of Senescence. Evolution, 1957. (Read short version here)

Additional Readings for class discussion:

4. Whale Grandmothers and Human Grandmothers

5. Fertility effects of BRCA

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