Shifts Between Deeper and Lighter Sleep

question 543

Multiple Choice

Shifts between deeper and lighter sleep

• A) occur only during the last half of a night's sleep.
• B) occur just once per night unless the sleeper is suddenly awakened.
• C) occur throughout the night.
• D) are the first sign of sleep deprivation.

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Definitions:

Respiratory Membrane

The structure in the lungs where gas exchange between the air and blood takes place, consisting of alveolar and capillary walls.

Tuberculosis

An infectious disease caused by the bacterium Mycobacterium tuberculosis, primarily affecting the lungs but can spread to other organs.

Partial Pressure

The pressure that a single gas component in a mixture of gases would exert if it occupied the entire volume alone at the same temperature.

Pulmonary Capillaries

Tiny blood vessels located within the lungs where gas exchange, including the uptake of oxygen and release of carbon dioxide, occurs.