Throughout the First Half of the Twentieth Century, Percent of Marriages

question 58

Multiple Choice

Throughout the first half of the twentieth century, percent of marriages lasted until the children left home.

• A) 80
• B) 70
• C) 60
• D) 50

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Definitions:

T Tubule

T Tubules, or transverse tubules, are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the rapid transmission of signals.

Triad

Two terminal cisternae and a T tubule between them.

Mitochondria

Organelles found in large numbers in most cells, where the biochemical processes of respiration and energy production occur.

Skeletal Muscle Fibers

The long, cylindrical cells that make up skeletal muscles, responsible for voluntary movements through contraction.