Which of the following statements regarding grids is correct?
a. They may be used with both intraoral and extraoral radiography.
b. They are composed of thin lead strips alternating with a radiolucent material.
c. They reduce the amount of radiation needed to produce an image.
d. They may add to the potential to increase film fog.
b. The grid, composed of lead strips alternating with a radiolucent material, is placed between the patient and the film to absorb scatter radiation and reduce film fog to improve image contrast.
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Darker lines further divide EKG graph paper every fifth square. Each large square measures 5 mm in height and width and represents a time interval of:
A. 0.10 seconds. B. 0.20 seconds. C. 0.4 seconds. D. 0.12 seconds.
Also called afferent neurons, the ____ pick up information from receptors at the tip of their dendrites.
A. sensory neurons B. microglia C. interneurons D. motor neurons