The Moon Keeps the Same Face Turned Toward the Earth

question 9

Multiple Choice

The Moon keeps the same face turned toward the Earth because it

• A)Does not rotate
• B)Rotates once per revolution about the Earth
• C)Rotates in a retrograde direction
• D)Rotates once per year

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Definitions:

Synovial Membranes

Membranes lining the joint cavities, producing synovial fluid to lubricate and nourish the joints.

Negative Pleural Pressure

The subatmospheric pressure in the pleural cavity that helps keep the lungs inflated.

Surfactant

A substance that tends to reduce the surface tension of a liquid in which it is dissolved, significant in the lungs for preventing alveolar collapse.

Intra-Alveolar Pressure

The pressure within the alveoli of the lungs, critical in the mechanics of breathing and the exchange of gases.