Question NBd part 1

[babyteeth]

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What happenes if we cut parasimphatic inervation to the heart???

 

[Dr Pablo]

Parasymp is inhibitory to the heart.So, if it's invernation to the heart is cut then there will be no inhibitory action on the heart & the risk of tachycardia increases.This is what I understand.Hope it helps.You can always search for answers on Google.

Good luck with your boards.

 

[Khurram]

Doesn't the stylomandibular ligament attach on the lingula of the mandible?
And the spehnomandibular attaches on the angle of the mandible?

Is this correct because that's what i thought it was but on one of the questions in the old exams it says that sphenomandibular attaches to the lingula.

Am i confusing the two?

 

[dent2003]

hi friends i have dought regarding brachiocephalic vein. i read in decks.
left internal jugular vein left subclavian vein form brachiocephalic vein.in another deck says external jugular vein subclavian form brachiocephalic vein. iam confusing. could any one explain me.

 

[treasure]

Here is my two cents.....
As far as I know, the brachiolcephalic vein is formed by the union of the internal jugular & subclavian just medial to the insertion of the scalenus anterior muscle. However, before this union takes place the subclavian is joined by a "tributary' -- the external jugular vein.

So the brachiocephalic is in fact the union of the int. jug & subclavian...... Correct me if i am wrong...
thanks, bye,
Treasure

 

[SJ35]

Doesn't the stylomandibular ligament attach on the lingula of the mandible?
And the spehnomandibular attaches on the angle of the mandible?

Is this correct because that's what i thought it was but on one of the questions in the old exams it says that sphenomandibular attaches to the lingula.

Am i confusing the two?

Sphenomandibular lig. attaches to the lingula of the mandible. And stylomandibular attaches to the angle of mandible. I learned them by remembering that one end of those ligaments is narrow. So if it starts at styloid process, the other end has a broad attachment at the angle of mandible. And if it starts by the broad attachment to the sphenoid bone, then the other end is narrow and attaches to the lingula of mandible.
Don't know if I explained that clearly enough, though 🙂

 

[Khurram]

The widest occulsal/incisal embrasure is located between which two teeth?

I thought it was between max canine and first pre molar and i could swear taht it was in teh decks that way too but in the released exam it said

between the maxilarry lateral incisor and canine...

please help out

 

[stomato]

the WIDEST incisal embrasure is bw max. canine and premolar(I-B 1980; the LARGEST is bw max canine and lateral incisor( I-D 1981)

 

[babyteeth]

When a brief period of hysterical hyperventilation causes respiratory alkalosis , tetany migth be cause by a sudden decreased in which of the following kind of calcium??

a.-total serum
b.-ionized serum
c.-citrate bound
d.-serum protein

NDB part 1 , December 2000


Does anybody can help me??I got 2000 unreleased exam, but they dont came with the answers!!I will keep posting the questions!if you guys want

 

[ItsGavinC]

The answer should be B) ionized serum calcium.

Tetany is a major result of hypocalcemia and tetany results from decreased serum ionized calcium concentrations.

 

[dentistforu]

hi
i have a quick ques,
assuming p50 is 26 torrs ,under normal conditions where po2 is 30 torrs the average no.of o2 molecules bound per hemoglobin molecule is closest to?
a.0.5
B.LEES THAN 1
C.ALMOST 2
D.GREATER THEN 2
E.GREATER THAN 3

ANS IS GREATER THAN 2
COULD U TELL ME HOW TO get this one.

also i am bad at ques on occlusion
if lateral excursion where does one cusp lie etc can anyone give me a link or a short exlanation to an easy way to remember it

i am in a fix
i would really appreciate some help
thanks

 

[ItsGavinC]

hi
i have a quick ques,
assuming p50 is 26 torrs ,under normal conditions where po2 is 30 torrs the average no.of o2 molecules bound per hemoglobin molecule is closest to?
a.0.5
B.LEES THAN 1
C.ALMOST 2
D.GREATER THEN 2
E.GREATER THAN 3

ANS IS GREATER THAN 2
COULD U TELL ME HOW TO get this one.

To answer this problem correctly, you must know the oxygen dissociation equation for hemoglobin, as well as the n for hemoglobin. The equation to solve for y looks like this:

(pO2)^n
_______________
(pO2)^n + (p50)^n


y is the fractional occupancy of oxygen binding sites and is what the question is looking for.

p50 is the partial pressure of oxygen that allows 50% of the sites to be filled.

pO2 is the partial pressure of unbound oxygen.

n for hemoglobin is 2.8. Notice that each of those above items is raised to the power of n, or 2.8.

So, putting in the numbers yields y = 60%. That corresponds with choice D because for each hemoglobin molecule there are more than 2 oxygen molecules bound since the hemoglobin that is available is more than 50% saturated with oxygen.

 

[dentistforu]

thanks for the quick reply
also plz help me with my occlusion questions
i am in big trouble there 😕