MDS PREP
A patient with severe nausea and vomiting is prescribed metoclopramide. What is the primary mechanism of action of metoclopramide?
(1) Antihistaminic action
(2) Dopamine antagonism in the CNS
(3) Muscarinic receptor antagonism
(4) 5-HT3 receptor antagonism
Metoclopramide acts primarily as a dopamine D2 receptor antagonist in the chemoreceptive trigger zone in the brain and in the gastrointestinal tract, which helps to reduce nausea and vomiting by decreasing gastric emptying and increasing gastric tone.
Which of the following statements is true?
1. A measure that has reliability is always valid
2. A measure that carries validity always carries reliability
3. Reliability and validity are not related
4. None of the above
Public Health Dentistry
Answer: 2
A measure that has validity is necessarily reliable, as reliability
is a prerequisite for validity. However, a measure that is reliable does not
necessarily mean it is valid. Validity refers to the degree to which a
measurement tool accurately measures what it is intended to measure. Reliability
is the consistency of the results produced by the tool.
Who is the founder of functional regulator
1) Pierre Robin
2) Andrews
3) Frankel
4) Anderson
Orthodontics
Answer: 2
What is the elastic limit of a wire, and what happens when a wire is deflected beyond this point?
1) The elastic limit is the point at which the wire begins to deform plastically.
2) The elastic limit is the force needed to permanently deform a wire.
3) The elastic limit is the maximum force a wire can withstand before fracture.
4) The elastic limit is the point at which a wire will always return to its original shape regardless of the force applied.
The elastic limit, also known as the yield strength, is the point at which a wire starts to undergo permanent deformation. When a wire is deflected beyond this point, it does not return to its original shape completely.