Can anyone answer this NBDE question

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chasan2

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which of the following can increase the diffusion of oxygen thru alveolar membrane?
1. increase cross-sectional area
2. decrease concentration gradient
3. decrease temp
 
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Originally Posted by chasan2
which of the following can increase the diffusion of oxygen thru alveolar membrane?
1. increase cross-sectional area
2. decrease concentration gradient
3. decrease temp
 
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Dana_Popescu said:
Originally Posted by chasan2
which of the following can increase the diffusion of oxygen thru alveolar membrane?
1. increase cross-sectional area
2. decrease concentration gradient
3. decrease temp
Click to expand...
The answer is 1. Decreasing the concentration gradient would reduce oxygen diffusion, due to the smaller discrepancy in oxygen content between the two chambers.
 
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agree ans is 1 the diameter off the surface is proportional with the oxigen diffusion
 
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in the interest of not starting a new thread to ask this question, i would like to know:

in what part of the lung or pleural cavity is lung cancer the most common?

can't seem to find the answer, any help would be appreciated. thanks!
 
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another question i KNOW i've seen on one of the previous tests, but can't seem to find it for the life of me and it's driving me nuts:

something about the location of an abscess after 3rd molar extraction? swelling in the neck and oropharyngeal area? is it the retropharyngeal?
 
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How many nucleotides are needed to code for protein with 150 aminoacid?
a 50
b 150
c 300
d 450
e 600
 
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An analysis of ECG shows P wave occuring in ST segment .This would indicate ectopic beats originating in the
a atria
b A-V node
c lower portion of the bundle of his
d upper portion of bundle of his
 
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in essential hypertension ,which of teh following represents the classic autopsy finding in the kidney
a pyelonephritis
b glomerulonephritis
c benign nephrosclerosis
d renal artery stenosis
e renal infarction
 
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in essential hypertension ,which of teh following represents the classic autopsy finding in the kidney
a pyelonephritis
b glomerulonephritis
c benign nephrosclerosis
d renal artery stenosis
e renal infarction
 
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How many nucleotides are needed to code for protein with 150 aminoacid?
a 50
b 150
c 300
d 450
e 600


answer is 450..
 
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vijaggi said:
An analysis of ECG shows P wave occuring in ST segment .This would indicate ectopic beats originating in the
a atria
b A-V node
c lower portion of the bundle of his
d upper portion of bundle of his
Click to expand...

tats according to my concept....does anyone else have anything else ....
 
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ediddly said:
in the interest of not starting a new thread to ask this question, i would like to know:

in what part of the lung or pleural cavity is lung cancer the most common?

can't seem to find the answer, any help would be appreciated. thanks!
Click to expand...

Epithelium
 
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vijaggi said:
thanks dr37,dds8 nd perennialdent
i would appreciate if someone can explain me
Click to expand...

How many nucleotides are needed to code for protein with 150 aminoacid?
a 50
b 150
c 300
d 450
e 600


answer is 450..
user_offline.gif

Explaination is , 1 triplet codon helps in formation of 1 amino acid.
1 triplet codon means 3 nucleotides, so 3 x 150 = 450 nucleotides.

Hope this may help you.

Dentstu
 
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which of the following primary grooves uniting in the distal pit on the occlusal surface of the mandibular second molar represents the one that normally has no counterpart in the distal pit of first molar
a distolingual
b df triangular
c dl triangular
d distal marginal
e distal portion of central
 
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An analysis of ECG shows P wave occurring in ST segment .This would indicate ectopic beats originating in the
a atria
b A-V node
c lower portion of the bundle of his
d upper portion of bundle of his

The question states that the P wave occurs in the ST SEGMENT, it means that a simultaneous wave of depolarization starts during the ST SEGMENT(Isoelectric!). And the origin of such ectopic beats (“P WAVE”) will be in ATRIA. It can be in SA node (Atrial Extrasystoles or Atrial Premature beats) or Somewhere OUTSIDE SA node in the atria(Ectopic Atrial Pacemaker)

It will lead to [/B] Supra-ventricular Tachycardia[/B]

This question DOES NOT mean that there's an "electrical activity in the ventricles" during ST SEGMENT (as in Ventricular Ectopic Beats). During the QRS complex the atria repolarizes (but due to insignificant electrical activity doesn’t show on EKG) and the ventricles are depolarizing. Now in the ST segment the ventricles are completely depolarized. “P wave occurring in the ST segment” means that a NEW WAVE OF DEPOLARIZATION (NEW P WAVE) originates in the ATRIA (SA node/somewhere outside the SA node ); Atrial Extrasystole/Ectopic Atrial Pacemaker.

The correct answer to this question is OPTION NO. 1 = ATRIA.

(Ventricular ectopic beat presents as widening of QRS complex and not as "P wave" during ST segment. )


In total agreement with DDS8! 🙂
 
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Norepinephrine is the primary neurotransmitter of Sympathetic Nervous system. And adrenergic neurons simply are named because the neurotransmitter that fires them is synthesized in ADRENAL medulla.
Epinephrine is also synthesized in Adrenal medulla and is a methyl derivative of NE, but IS NOT A MEDIATOR AT POST GANGLIONIC SYMPATHETIC NEURONS.

Hope this clears your doubt. :*

I haven't yet started with the decks but they're very reliable. 🙂
 
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Ibanez said:
Norepinephrine is the primary neurotransmitter of Sympathetic Nervous system. And adrenergic neurons simply are named because the neurotransmitter that fires them is synthesized in ADRENAL medulla.
Epinephrine is also synthesized in Adrenal medulla and is methyl derivative of NE, but IS NOT A MEDIATOR AT POST GANGLIONIC SYMPATHETIC NEURONS.

Hope this clears your doubt.

I haven't yet started with the decks but they're very reliable. 🙂
Click to expand...
gotchya...crystal cler..thankzz😍
 
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vijaggi said:
which of the following primary grooves uniting in the distal pit on the occlusal surface of the mandibular second molar represents the one that normally has no counterpart in the distal pit of first molar
a distolingual
b df triangular
c dl triangular
d distal marginal
e distal portion of central
Click to expand...

I would say its D - distal marginal
 
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