Bottom-up processing is to ____ as top-down processing is to ____.

Most American adults need at least ____ hours of sleep a night, but actually average about ____ hours on weekdays.

For a lateral projection of the ankle, the central ray must enter the:

The negative side of the x-ray tube holds the:

Psychology is defined as the ____.

A fundamental principle of ethical practice is _________.

The independent variable is to the dependent variable as ____ is to ____.

The filament is made of:

How many heat units are generated by six (6) exposures of 400 mA, 95 kVp, and 26 ms using a high-frequency unit? [BLANK-1]

A scientific theory ____.