NBME 7 block 3 q 1 to 50 - maryam2009

[ArchivalUser]

45.BB

Empysema...permanent enlargement of all part of the respiratory unit...respiratory bronchioles,alveolar,alveoli
Causes:
cigarette smoking
alpha1 antitrypsin deficiency

There are 2 types....

1.Centriacinar...is charachterized by trapping of air in the respiratory bronchiole...elastic fibers of the distal TB are destroyed,causing obbstruction to airflow...this causes the trapped air to distend the RBs,whose elastic tissue support is destroyed.

2.panacinar...is charachterized by trapping of air in the entire respiratory unite behindd the collapsed TB

http://www.google.com/imgres?imgurl=http...CBsQ9QEwAg

[ArchivalUser]

47.EE

48.DD

...The study design is Case Control and in case control studies u can only determine the prevalence of the disease...In this case the duration is one year and it is period prevalence rather than point prevalence

posted by yeabiruh

[ArchivalUser]

49.AA

The sarcoplasmic reticulum serves as a repository for Ca++.
1.In rested muscle, Ca++ is found in high concentration in the cisternae at the triad.

2.In recently active muscle, the calcium is found in the narrowed, longitudinal portion from which it moves to the triad as time passes.

3.During contraction, Ca++ is found in high concentration outside the sarcoplasmic reticulum among the myofilaments

[ArchivalUser]

50.EE

Diphtheria toxoid the formaldehyde-inactivated toxin of Corynebacterium diphtheriae, used as an active immunizing agent against diphtheria, usually in mixtures with tetanus toxoid and pertussis vaccine (DTP or DTaP) or with tetanus toxoid alone (DT for pediatric use and Td, which contains less diphtheria toxoid, for adult use).

[ArchivalUser]

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Thank you to

god99
sash11
dna23
step1success

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[ArchivalUser]

46 SCID deficiencies in B and T cells----------this defect is early in the stem =cell differentition. Presents with recurrents viral, bacterial , fungal and protozoal infections, May have multiple causes (failure to synthesize MHCII antigens, defects IL-2 receptors or adenosine deficiency
Thanks Maryam

[ArchivalUser]

Excellent work, Thanks to Maryam, god99, sash11, and step1success

[ArchivalUser]

Thanks to you guys as well. excellent job, May we all get succeed.

[ArchivalUser]

Thanks guys a lot.
Excellent job. God bless you all!!!!!!!!!!!!

[ArchivalUser]

q 27, B - who knows the explanation?