The Element(s) That Have Proven Most Useful for Stable Isotope

question 67

Multiple Choice

The element(s) that have proven most useful for stable isotope studies are

• A) carbon only.
• B) nitrogen only.
• C) sulfur only.
• D) carbon, sulfur, and sometimes nitrogen.

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Definitions:

Lumen

The interior space or cavity of a tubular organ or structure, such as an artery or intestine, through which fluids pass.

Fenestrations

Small openings or pores, often found in the endothelial cells of capillaries, that allow for the exchange of substances between blood vessels and surrounding tissues.

Filtration Slits

Narrow gaps between the podocytes in the glomerulus of the kidney through which filtration of blood plasma occurs.

Podocytes

Highly specialized cells in the kidney that wrap around capillaries of the glomerulus, involved in filtration of blood to form urine.