Let's try again, join me for study group NBDE I may/June 2010

[blissonearth]

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Hi friends, let's continue the closed thread here. No promoting any materials here, just prop some in doubt questions as our exam is approaching fast.

 

[rose82]

just a q...how are u able to cut paste these q's from the ASDA papers...long long time back,i tried to do it..but couldnt.sorry for the offbeat q

 

[Lord Voldemort]

just a q...how are u able to cut paste these q's from the ASDA papers...long long time back,i tried to do it..but couldnt.sorry for the offbeat q

LOL....👍 we need some off topic stuff........

 

[happyk9]

Hi,

I have a question:

Which of the following structures calcifies first in an anterior tooth?
A. Cingulum
B. Cervical ridge
C. Marginal ridge
D. Incisal ridge
E. Root apex

The answer is D. I am confused. I remember that the oldest enamel is at cingulum in an anterior tooth. Doesn't the oldest enamel calcify first?

Please explain this to me. Thank you!

 

[sekhon]

why not myelin sheath?? i mean if isnt the myelin sheath plays role in conduction of nerve impulse?? in unmyelinated nerve fibres its slow and in myelinated its fast ..???

why cant 2 be the possible answer??

thanks

help appreciated.

http://books.google.co.in/books?id=...VELOCITY OF NERVE DEPENDS ON DIAMETER&f=false

 

[sekhon]

Hi,

I have a question:

Which of the following structures calcifies first in an anterior tooth?
A. Cingulum
B. Cervical ridge
C. Marginal ridge
D. Incisal ridge
E. Root apex

The answer is D. I am confused. I remember that the oldest enamel is at cingulum in an anterior tooth. Doesn't the oldest enamel calcify first?

Please explain this to me. Thank you!

[SIZE=-1] The
coronal cusps are first calcified, then the lateral surfaces[/SIZE]

 

[mosaicthoughts]

most of the glomerular filtration is done by diffusion m i correct???
the question is about LEAST important than how can 1 be the answer

i think ans can be 2. as like Na through a nerve membrane is by soduim potassium pump... where there is no diffusion...

anybody have idea?? correct me if wrong...

Na-K pump helps to move OUT 3 ions of Na for every 2 ions of K.It doesn play any role in causing Na to come inside.
Secondly glomerular filteration occurs due to pressure difference and the glomerulus filters almost everything including small proteins.There is no role of diffusion in GLOMERULUS.

 

[dontist]

is it really iron and calcium?? i mean american diet has more of cheeese, milk,, eggs and non vegetarian diet.. how can be it defecient in iron and calcium????

 

[dontist]

 

[dontist]

Hi,

I have a question:

Which of the following structures calcifies first in an anterior tooth?
A. Cingulum
B. Cervical ridge
C. Marginal ridge
D. Incisal ridge
E. Root apex

The answer is D. I am confused. I remember that the oldest enamel is at cingulum in an anterior tooth. Doesn't the oldest enamel calcify first?

Please explain this to me. Thank you!

i think it should be cingulum...

[SIZE=-1] The
coronal cusps are first calcified, then the lateral surfaces[/SIZE]

 

[jalika]

Which of the following statements best describes the facial vein?

• it is located within the substance of the parotid gland
• it communicates superiorly with the ophthalmic vein
• it is more tortuous than the facial artery
• it lies anterior to the facial artery as it passes through the face
• it usually empties into the external jugular vein

 

[wadent]

Which of the following statements best describes the facial vein?

• it is located within the substance of the parotid gland (facial nerve not vein)
• it communicates superiorly with the ophthalmic vein......ANSWER (becz connection with cavernous sinus ! ) correct me if iam wrong !!
• it is more tortuous than the facial artery (nope )
• it lies anterior to the facial artery as it passes through the face
• it usually empties into the external jugular vein (empties -->int jug vein)

so as a conclusion choice (B) is the bestttt
​

 

[jalika]

that's correct. what about this one?
The superior sagittal sinus:

• drains into the straight sinus
• is attached to the petrous temporal bone
• receives emissary veins from the scalp
• communicates with the cavernous sinus
• receives the superior petrosal sinus

 

[wadent]

that's correct. what about this one?
The superior sagittal sinus:

• drains into the straight sinus (here i know that inf.sagitl sinus drains to staright sinus ! )
• is attached to the petrous temporal bone
• receives emissary veins from the scalp....i think that the answer pls correct me if its wrong 🙂 😎
• communicates with the cavernous sinus
• receives the superior petrosal sinus (wrong)

 

[jalika]

A structure that can easily be injured during ligation of the superior thyroid artery is the:

• inferior laryngeal branch of the recurrent laryngeal nerve
• ascending pharyngeal artery
• superior parathyroid gland
• transverse colli nerve
• external branch of the superior laryngeal

 

[jalika]

that's correct. what about this one?
The superior sagittal sinus:

• drains into the straight sinus (here i know that inf.sagitl sinus drains to staright sinus ! )
• is attached to the petrous temporal bone
• receives emissary veins from the scalp....i think that the answer pls correct me if its wrong 🙂 😎
• communicates with the cavernous sinus
• receives the superior petrosal sinus (wrong)

that's what i think too. didn't have the answer for this one. all the sinuses receive emissary veins from the scalp, right?

 

[colours99]

Since they are asking abt, the "condition" i would choose 5. But i may be wrong...

PO2 (Partial Pressure of Oxygen) reflects the amount of oxygen gas dissolved in the blood. It primarily measures the effectiveness of the lungs in pulling oxygen into the blood stream from the atmosphere.
Elevated pO2 levels are associated with:

• Increased oxygen levels in the inhaled air
• Polycythemia

Decreased PO2 levels are associated with:

• Decreased oxygen levels in the inhaled air
• Anemia
• Heart decompensation
• Chronic obstructive pulmonary disease
• Restrictive pulmonary disease
• Hypoventilation

 

[colours99]

The external branch of the superior laryngeal nerve runs with the superior thyroid artery before turning medially to supply the cricothyroid muscle. High ligation of the superior thyroid artery during thyroidectomy places this nerve at risk of inadvertent injury, which would produce dysphonia by altering pitch regulation.
The inferior thyroid artery has a variable branching pattern and is closely associated with the recurrent laryngeal nerve.

A structure that can easily be injured during ligation of the superior thyroid artery is the:

• inferior laryngeal branch of the recurrent laryngeal nerve
• ascending pharyngeal artery
• superior parathyroid gland
• transverse colli nerve
• external branch of the superior laryngeal

 

[dontist]

Na-K pump helps to move OUT 3 ions of Na for every 2 ions of K.It doesn play any role in causing Na to come inside.
Secondly glomerular filteration occurs due to pressure difference and the glomerulus filters almost everything including small proteins.There is no role of diffusion in GLOMERULUS.

Since they are asking abt, the "condition" i would choose 5. But i may be wrong...

PO2 (Partial Pressure of Oxygen) reflects the amount of oxygen gas dissolved in the blood. It primarily measures the effectiveness of the lungs in pulling oxygen into the blood stream from the atmosphere.
Elevated pO2 levels are associated with:

• Increased oxygen levels in the inhaled air
• Polycythemia

Decreased PO2 levels are associated with:

• Decreased oxygen levels in the inhaled air
• Anemia
• Heart decompensation
• Chronic obstructive pulmonary disease
• Restrictive pulmonary disease
• Hypoventilation

hey thank u bot of u guys... that was excellent explanation...👍👍👍👍

btw can u all pl answer few questions which i posted in previous page?? no one answered few of them .. just have a look i posted on the previous page.....

 

[dontist]

in which of the following condition oxygen partial pressure in arterial blood is low??

1 anaemia
2 polycythemia
3 pulmonary AV shunt
4 hypovolemia due to hemorrage.

GUYS I THINK IN ANEMIA THERE IS DECREASE ON PO2 RIGHT??
I AM CONFUSED WITH PULMONARY AV SHUNT, HYPOVOLEMIA AND ANEMIA.

CAN ANYBODY EXPLAIN ME WHAT CAN BE THE CORRECT ANSWER AND HOW?

POLYCYTHEMIA THERE IS INCREASE IN 02

 

[happyk9]

I have a question from an old DA paper:

--------------------------------------------------
Jaw closure in parafunctional activity varies from masticatory activity in which of the following ways?
a. Teeth seldom, if ever, contact in mastication.
b. Teeth are in tight contact during mastication.
c. Teeth seldom, if ever, contact in parafunction.
d. Teeth are in tight contact during parafunction.
e. Masticatory cycles are vertical and cyclic.
1. (a) and (c) only
2. (a), (c) and (e)
3. (a), (d) and (e)
4. (b) and (c)
5. (b) and (d)
----------------------------------------------------------

The answer is 3.

I don't understand this question at all. Can anyone tell me what concept is this question testing? Why a, d and e are correct?

 

[happyk9]

in which of the following condition oxygen partial pressure in arterial blood is low??

1 anaemia
2 polycythemia
3 pulmonary AV shunt
4 hypovolemia due to hemorrage.

GUYS I THINK IN ANEMIA THERE IS DECREASE ON PO2 RIGHT??
I AM CONFUSED WITH PULMONARY AV SHUNT, HYPOVOLEMIA AND ANEMIA.

CAN ANYBODY EXPLAIN ME WHAT CAN BE THE CORRECT ANSWER AND HOW?

POLYCYTHEMIA THERE IS INCREASE IN 02

This question is to test the difference of oxygen content and oxygen partial pressure. Anamia, polycythemia and hypovolemia all have lower oxygen content but normal partial pressure. Only pulmonary AV shunt has lower oxygen partial pressure since some un-oxygenated blood directly goes to systemic circulation without going to the lung.

 

[dontist]

This question is to test the difference of oxygen content and oxygen partial pressure. Anamia, polycythemia and hypovolemia all have lower oxygen content but normal partial pressure. Only pulmonary AV shunt has lower oxygen partial pressure since some un-oxygenated blood directly goes to systemic circulation without going to the lung.

thanks....😀😀😀 but in polycythemia isnt there is more oxygen content? as there is more ?? as RBC are more??

 

[happyk9]

Another DA question:

---------------------------------------
Which of the following morphologic variation tend to accelerate existing periodontal disease?
a. Shoveling trait in central incisors
b.Excessively long roots
c. Enamel projections
d. Fused roots
e. Excessively short roots
1. (a) and (b) only
2.(a), (b), (c) and (d)
3. (a), (b), (c) and (e)
4. (b), (c) and (d) only
5. (c), (d) and (e)
-------------------------------------------

The correct answer is 5. Can anyone explain this to me?

 

[dontist]

i think u forgot to type (e) option... 🙂

 

[happyk9]

thanks....😀😀😀 but in polycythemia isnt there is more oxygen content? as there is more ?? as RBC are more??

I did not explain this very clearly. Primary polycythemia doesn't necessary have higher oxygen content. It should be normal. Secondary polycythemia usually has lower oxygen content. This is because lower oxygen content cause more RBC to proliferate. So lower oxygen content is the cause, not the result. So polycythemia will have either normal oxygen content or lower oxygen content.

 

[dontist]

what are the test to determine hypoventilation and hyperventilation??

i mean i came across a question in papers.. which says the imp test to check hypoventillation is the level of arterial Co2 tension. ----->>>>a small query is why arterial carbon dioxide level only?? i mean hypoventilation can also be found if v measure arterial oxygen tension right???

i meant why not 3 can be the answer????


so what about hyperventillation?? do we check for arterial O2 tension?? or 🙂 just a guess..but i am not able to find how to check hyperventillation.....

if anybody knows pl tell ....

thanks guys

 

[dontist]

 

[teethie]

HI, agree with colours99 and wadent for the answers.

that's correct. what about this one?
The superior sagittal sinus:

• drains into the straight sinus (here i know that inf.sagitl sinus drains to staright sinus ! )
• is attached to the petrous temporal bone
• receives emissary veins from the scalp....i think that the answer pls correct me if its wrong 🙂 😎
• communicates with the cavernous sinus
• receives the superior petrosal sinus (wrong)

Since they are asking abt, the "condition" i would choose 5. But i may be wrong...

PO2 (Partial Pressure of Oxygen) reflects the amount of oxygen gas dissolved in the blood. It primarily measures the effectiveness of the lungs in pulling oxygen into the blood stream from the atmosphere.
Elevated pO2 levels are associated with:

• Increased oxygen levels in the inhaled air
• Polycythemia

Decreased PO2 levels are associated with:

• Decreased oxygen levels in the inhaled air
• Anemia
• Heart decompensation
• Chronic obstructive pulmonary disease
• Restrictive pulmonary disease
• Hypoventilation

 

[wadent]

thanks teethie!

 

[DrGSP]

Ans - 2

Isoelectric point is the Ph at which, protein has a neutral charge and remains stationary.
Below this a protein carries positive charge and moves to a negative pole.
Above this a protein carries negative charge and moves to a positive pole.

]

 

[dontist]

thanks DrGSP... tht was nice ....🙂 i was confused with when ph will increase and what charge it will posses.... plus the question is something mistyped i guess... so i posted here...

 

[jalika]

Pulsations felt just above the zygomatic arch and in front of the ear are from which vessel?

• facial
• internal jugular vein
• superficial temporal artery
• retromandibular vein
• maxillary artery

 

[jalika]

The floor of the sella turcica is also the:

• diaphragma sella
• roof of the sphenoid sinus
• medial wall of the temporal fossa
• roof of the nasal cavity
• site of attachment of the superior pharyngeal constrictor muscle

 

[wadent]

The floor of the sella turcica is also the:

• diaphragma sella
• roof of the sphenoid sinus............answer 100 % sure no need to correct me (becz from here u can reach the pitutary gland during surgey only ! ...)
• medial wall of the temporal fossa
• roof of the nasal cavity
• site of attachment of the superior pharyngeal constrictor muscle

 

[wadent]

Pulsations felt just above the zygomatic arch and in front of the ear are from which vessel?

• facial
• internal jugular vein
• superficial temporal artery ....answer (common sense ! .........correct me if iam wrong !!)
• retromandibular vein
• maxillary artery

 

[dontist]

isnt it hemoglobin?? Why cytochromes???

plz answer this.....

And does anyone know what is subliminal fringe??????

AND WHAT IS CENTRAL FACILITATION?? 😀

 

[happyk9]

Feels like not too many people want to answer these questions. Too sad....

 

[dontist]

Feels like not too many people want to answer these questions. Too sad....

yes... even i have been noticing this since couple of days.... dont know where are ppl... and y not answering.. 🙁

 

[Lord Voldemort]

yes... even i have been noticing this since couple of days.... dont know where are ppl... and y not answering.. 🙁

lol..we are all here.....unfortunately..i didnt know wat sublimal fringe was...!😱
google it...!

 

[dontist]

well lord.. i already googled it.. did not found relevance much by which i can able to understand little bit.. thts y i posted it.. lol

 

[coucou]

plz answer this.....

And does anyone know what is subliminal fringe??????

AND WHAT IS CENTRAL FACILITATION?? 😀

THE FIBRES HAVE EPSP evoked without achieving firing level , meaning :the excitability of the motor neuron is increased.so this group of excited neurons is called the subliminal fringe.therefore such fringe accounts for enhancements of reflex responses...
clenching teeth and squeezin fist can cause thiese kind of replex...which is called central facilitation

 

[dontist]

thanks a lot for the valuable share... 🙂

 

[aathmashree]

1.B-oxidation of 1 mole of 18c fatty acid under physiological condition produces
1.1 mole of acetc acid
2.9 moles of acetyl co a

how?,can any1 plz explain



2.venous return would b reduced during
ans.1.forced expiration with glottis closed
2.rhythmic exerscise

.

 

[rose82]

lol..we are all here.....unfortunately..i didnt know wat sublimal fringe was...!😱
google it...!

i agree..im here too😀...the only thing is im not getting any answer Actually speaking,the very old papers have few bizzare q's..no relation and no connection.

 

[rose82]

2.venous return would b reduced during
ans.1.forced expiration with glottis closed
2.rhythmic exerscise

.

http://en.wikipedia.org/wiki/Venous_return_curve

in exercise and inspiration,venous return increases

 

[Lord Voldemort]

guys......heres somethin i didnt understand......

which of the following arteries is NOT derived from celiac trunk or its branches?

-left gastric
-short gastric
-gastroduodenal
-left gastroepiploic
-inferior pancreaticoduodenal

the answer in the asda papers is left gastro epiploic! HOW.....

it should be inferior pancreaticoduodenal coz its a branch of superior mesenteric!😕😕😕😕

 

[wadent]

ur correct i agree with ya 100%

 

[aathmashree]

http://en.wikipedia.org/wiki/Venous_return_curve

in exercise and inspiration,venous return increases

tnz` rose
,another q.
osmotic pressure of filtrate at end of prox.conv.tubule is

ans.
1.about same as that plasma.
2.greater than that of plasma n yyyyyyyyyyy

 

[sekhon]

Pulsations felt just above the zygomatic arch and in front of the ear are from which vessel?

• facial
• internal jugular vein
• superficial temporal artery ....answer (common sense ! .........correct me if iam wrong !!)
• retromandibular vein
• maxillary artery

[/QUOT👍👍👍👍

u r correct

 

[sekhon]

1.B-oxidation of 1 mole of 18c fatty acid under physiological condition produces
1.1 mole of acetc acid
2.9 moles of acetyl co a

how?,can any1 plz explain

yes sure i l tell u an easy way dear
🙂beta oxidation occurs through the sequential removal of
2-carbon units
by oxidation at the b-carbon position of the fatty acyl-CoA molecule.

. Each round of b-oxidation produces one mole of NADH, one mole of FADH2 and one mole of acetyl-CoA, which then enters the KC,

soooooo 18 c >>>>>>>produce 9 moles of acetyl coa

sooooo 16 c>>>>>>>..8 moles of acetyl coa👍




2.venous return would b reduced during
ans.1.forced expiration with glottis closed>>>>>>>>>>>>
2.rhythmic exerscise

.[/QUOT