⟩ What is central nervous system?
central nervous system one of the major divisions of the human nervous system, it consists of the brain, spinal cord, optic nerves, and retina, and is primarily responsible for storing and processing information
central nervous system one of the major divisions of the human nervous system, it consists of the brain, spinal cord, optic nerves, and retina, and is primarily responsible for storing and processing information
Ionization occursa. when atoms lose electrons; they become deficient in negative charges and therefore behave as positively charged atoms.b. when atoms gain electrons; they become positively chargedc. when an atom loses its nucleusd. only whn K-orbit electron is ejected and replaced by an L-orbit
Greater beam limitation is achived when the PID is ________ and the diameter of the opening is __________.a. shorter; smallerb. longer; biggerc. shorter; biggerd. longer; smaller
which of the following is the location in which thermonic emission occurs?a. positive cathodeb. postive anodec. negative cathoded. negative anode
the difference in degrees of blackness between adjacent areas on a dental radiograph is termeda. densityb. contrastc. subject thicknessd. diagnostic quality
A variation in the true size and shape of the object being radiographed is termeda. magnificationb. distortionc. sharpnessd. resolution
True/False;True/FalseRadiation is the emission and propatation of energy through space or a substance in the form of waves or particles. Radioactivity can be defined as the process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear state
Which of the following statements is true of general radation?a. it is also known as braking (bremsstrahlung) radiationb. it is also known as characteristic radiationc. it is the source of the majority of x-rays that are producedd. both a and c
What does ALARA stand for?
Which premolar usually has two roots?a. maxillary firstb. maxillary secondc. mandibular firstd. mandibular second
When the mouth is opened widely, the articular disk movesa. mediallyb. laterallyc. anteriorlyd. none of the above, it does not move