board question

[aerotech]

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hi,
can someone please help me with these questions:

Destruction of the left spinocerebellar tract at T2 would be expected to eliminate positional sense on:
a.right side of body above T2
b.right side of body below T2
c.left side of body below T2
d. left side of body above T2

The Continuous Flow Of Blood In Arteries During Diastole Is Made Possible By:
1.the Thoracic Pump.
2.relaxation Of Arterioles.
3.the Pumping Action Of Skeletal Muscles.
4.energy Stored In Arteries During Systole.



thank you so much!!

 

[ElDienteLoco]

hi,
can someone please help me with these questions:

Destruction of the left spinocerebellar tract at T2 would be expected to eliminate positional sense on:
a.right side of body above T2
b.right side of body below T2
c.left side of body below T2
d. left side of body above T2

The Continuous Flow Of Blood In Arteries During Diastole Is Made Possible By:
1.the Thoracic Pump.
2.relaxation Of Arterioles.
3.the Pumping Action Of Skeletal Muscles.
4.energy Stored In Arteries During Systole.



thank you so much!!

1st question...

Doesn't proprioceptive sense cross to the contralateral side immediately before ascending the spinal cord? I think so. That would give you a sensory deficit on the contralateral side (right side) below T2. The deficit would be below T2 because that tract is carrying all information from below that point. I think the answer would be 'B.'

2nd Question:

Elastic tissue in the arteries store energy during systole by stretching. When diastole begins, the stored energy in the elastic tissue increases pressure during diastole by trying to close back down to the lower energy state. The flow through the rest of the arterial system stays pretty constant because of this.

That is why you get a larger pulse pressure (difference between systole and diastole) when the arteries are stenotic.

I hope this helps. I'm pretty sure about the 1st question and positive about the 2nd...I just hope I was able to explain it in a way that could help.

 

[aerotech]

Hi,thank you very much,it really helps...the recent exams have many errors in their answer choice,that's why i wanted to confirm..i just have one more question:

which unique aspect of cariogenic strains of strep mutans sets them apart from other oral acidogenic organisms?
a.tendency to form chains
b.secretion of proteolytic enzymes
c.extracellular polysacc from glucose
d.formation of water insoluble glucans from sucrose
e.four equiv of acid formed per mole of glucose

*** i know the answer should be "d" for strep mutans...but is that what sets them apart from other bacteria (since it can be "b" b/c it produces glucosyltransferase)...sorry if i'm making it confusing than it actually is..just want to clarify!thanks!

 

[ElDienteLoco]

Glucosyltransferase isn't a proteolytic enzyme. 'd' is talking about glucosyltransferase.

From my cariology text:

The glucosyltransferases (GTF) of the mutans-group of streptococci have received considerable attention,27 and several isozymes have been isolated. There are two types of these enzymes: (1) those that synthesize a soluble glucan with predominantly 1,6-α-D-glucose sequences (GTF-S), and (2) those that synthesize an insoluble, essentially linear 1,3-α-D glucan (GTF-I). Bifunctional enzymes with 1,6-α-bond and 1,3,6-branch-forming activities have been purified.150 By cooperative action of these enzymes, a sticky, water-insoluble polysaccharide is synthesized from sucrose that is a major factor in the accumulation of mutans-group streptococci on smooth tooth surfaces.
(Newbrun, Ernest. Cariology, 3rd Edition. Quintessence, 1989. 4.8).

 

[ElDienteLoco]

As a side note about errors in the keys of recent exams...I know sometimes it seems that way, but sometimes...right or wrong...that is the answer that is going to be marked "correct" on you scantron come test day.

I hate trying to guess what the board it thinking and not what really matters!

 

[aerotech]

it's quite frustrating b/c i've done all the old exams and then started doing the recent ones and there are conflicting answers...i have encountered a couple of questions from the actual released exams that also had different answers...it's so annoying...but thanks for your help...appreciate it!! best of luck on monday

As a side note about errors in the keys of recent exams...I know sometimes it seems that way, but sometimes...right or wrong...that is the answer that is going to be marked "correct" on you scantron come test day.

I hate trying to guess what the board it thinking and not what really matters!