One Part of the Nurses Health Study Focuses on Possible

question 37

Essay

One part of the Nurses Health Study focuses on possible causes of skin cancer.Nurses were asked about different behaviors and aspects of their health when theyentered the study. Those nurses subsequently diagnosed with cancer were given thequestionnaires again. Investigators discovered that after the diagnosis the nursestended to report a reduced ability to tan. The investigators concluded that the shift inreporting might be caused by an awareness of their diagnosis.

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Definitions:

Passive Transport

The movement of ions and other molecular substances across cell membranes without the need for energy input.

Sieve Elements

Specialized cells in the phloem of vascular plants that are involved in the transport of sugars and nutrients.

Sink Cells

Cells that act as a metabolic or storage sink, usually absorbing and storing nutrients transported from source cells in an organism.

Source Cells

Cells that provide or have the potential to provide necessary components or functions for repair or growth, often referring to stem cells.