The Polar Front

question 17

Multiple Choice

The polar front:

• A)is not associated with the polar jet stream.
• B)is a region of small changes in the slope of pressure surfaces.
• C)is a region marked by a sharp change in horizontal temperature.
• D)is a boundary between two regions of cold air.

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Definitions:

Skeletal Muscle Fibers

The cells of skeletal muscles, characterized by their long, striated appearance and role in voluntary movement.

Myofibrils

Long, filamentous organelles found inside muscle cells that are highly specialized for contraction.

Keratin

A type of structural protein that is key to the formation of hair, nails, and the outer layer of skin in humans and animals.

Axial Skeleton

The central portion of the skeleton, consisting of the skull, vertebral column, ribs, and sternum, providing fundamental support and protection to the human body.