Shown below is an electron micrograph of part of a myofibril from a relaxed muscle fiber.Which of the labeled regions will NOT shorten when the muscle contracts? 
Definitions:
Pork Production
The process of breeding, raising, and processing pigs for meat (pork) as a food product.
Tons Of Beans
A measure of quantity, typically used in the agricultural or commodity markets, referring to the mass of beans.
World Exports
The total value or volume of goods and services sent from one country to be sold or traded in other countries.
Trade Deficits
A situation in which a country's imports of goods and services exceed its exports, leading to a net outflow of domestic currency to foreign markets.
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