lymph node histology

[docsmiley]

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hi..
during an infection,
where in the lymph node r plasma cells found....
1.germinal centers
2.medullary cords
2 paracortex.

i feel in the medullary cords..
is it right??
pls confirm...

 

[Cold Front]

The medullary cords are cords of lymphatic tissue, and include plasma cells and T cells

 

[docsmiley]

thanx for the response...
one more..
the mesiofacial groove of the lower 1st molar accepts which of the foll...
1.tip of Mf cusp of upper 1st molar
2.triangular ridge of mf cusp of upper 1st molar..

 

[docsmiley]

what has the lowest po2??
1.expired air
2.venous blood..

 

[docsmiley]

baroreceptor reflex travels thru which nerve..
1 9th nerve
2.10th nerve

i feel..both r true..but both r given as options....

 

[docsmiley]

hi..
during periodontitis,
which is first invaded???
1.sulcular epithelium
2 junctional epithelium...

 

[Cold Front]

thanx for the response...
one more..
the mesiofacial groove of the lower 1st molar accepts which of the foll...
1.tip of Mf cusp of upper 1st molar
2.triangular ridge of mf cusp of upper 1st molar..

similar question is actually on the 98 exam (#128)

 

[Cold Front]

baroreceptor reflex travels thru which nerve..
1 9th nerve
2.10th nerve

i feel..both r true..but both r given as options....

This would depend on location..

carotid sinus = CNIX
aortic arch = CNX

 

[Cold Front]

hi..
during periodontitis,
which is first invaded???
1.sulcular epithelium
2 junctional epithelium...

 

[Cold Front]

what has the lowest po2??
1.expired air
2.venous blood..

Blood returning to the heart from the tissues has a low PO2 of 40 mmHg, while in expired air is 120 mmHg.

Essentially, we breath in 150 mmg from atmosphere, drops to 104 mmHg at the alveoli, and then it jumps to 120 mmHg at expiration.

 

[docsmiley]

hey..
thanx so much for ur detailed answers.....

 

[docsmiley]

nerve of pterygoid canal has sympathetic branches from which of these..
1.otic ganglion
2 great petrosal nerve
3.9th nerve
4.sup cervical ganglion
5.facial nerve..

 

[docsmiley]

graft rejection is most commonly due to....
1.cell mediatedimmunity...
2.humoral immunity
3.both together....
they hv not mentioned whether rejection is acute or chronic.....

 

[Cold Front]

nerve of pterygoid canal has sympathetic branches from which of these..
1.otic ganglion
2 great petrosal nerve
3.9th nerve
4.sup cervical ganglion
5.facial nerve..

nerve of the pterygoid canal contains postganglionic sympathetic fibers from the deep petrosal nerve (which carries postsynaptic sympathetic nerve fibers to the pterygopalatine ganglion). Pterygopalatine ganglion has a sympathetic root which consists of sympathetic efferent (postganglionic) fibers from the superior cervical ganglion.

 

[Cold Front]

graft rejection is most commonly due to....
1.cell mediatedimmunity...
2.humoral immunity
3.both together....
they hv not mentioned whether rejection is acute or chronic.....

The question is asking in general... not specific type of rejection.

 

[docsmiley]

thanx coldfront for ur quick replies...
some of these questions in the unreleased papers hv wrong answers marked on them...