The Body's First Line of Defense Against the Invasion of Disease-Causing

question 246

Multiple Choice

The body's first line of defense against the invasion of disease-causing microorganisms is ________.

• A) phagocytes
• B) natural killer cells
• C) skin and mucous membranes
• D) inflammatory response
• E) fever

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Definitions:

Spline

A series of ridges or teeth on a drive shaft that mesh with grooves in a mating piece, allowing torque to be transferred while permitting some axial movement.

Yoke

Any of a number of different fork-shaped components. Shift yokes (on shift rails) fit to dog clutches in a transmission to move them in and out of engagement. A pair of drive shaft yokes couple to each other using a U-joint as an intermediary.

Brinelling

Minor indentations on the shoulder or in the valley of a bearing race, usually caused by improper installation.

Spalling

Surface fatigue that occurs when chips, scales, or flakes of surface metal separate because of fatigue rather than wear.