إعـــــــلان

**bhloool** · 02-10-2009, 07:10 PM

شكرا دكتور اشرف للتوضيح ف الاسئله السابقه
135-Plts adhesion is the adhesion of Plts to the exposed subendothelial connective tissue surfase
while Plts aggregation is the adhesion of PLts to each other to form plug at the site of injury
136- thromboxane A2 lowers Plts cyclic adenosine monophosphate (cAMP)levels and so raise intracellular free calcium causing secondary PLts granules release reaction, local vasoconstriction, and further local PLts aggregation.
137-?????????

**hematologist** · 02-10-2009, 07:31 PM

135-

platelet adhesion

التصاق الصفائح على سطح غير صفيحي , مثلا التصاقها مع الكولاجين او عامل فون ويلبراند .

platelet aggregation

التصاق الصفائح بينها وبين بعض , Platelets to platelets joining

136-

Thromboxane A2

is a thromboxane. It is produced by activated platelets and has prothrombotic properties: it stimulates activation of new platelets as well as increases platelet aggregation.

137-

PFA-100

The PFA-100 is a platelet function analyser that aspirates blood in vitro from a blood specimen into disposable test cartridges through a microscopic aperture cut into a biologically active membrane at the end of a capillary. The membrane of the cartridges is coated with collagen and adenosine diphosphate (ADP) or collagen and epinephrine inducing a platelet plug to form which closes the aperture.

**sami206** · 02-10-2009, 07:44 PM

هل توجد جوائز؟

**ashraf shaq** · 02-10-2009, 11:43 PM

المشاركة الأصلية بواسطة sami206 مشاهدة المشاركة

هل توجد جوائز؟

جائزتنا انك مريت علينا وشفناك

**ashraf shaq** · 03-10-2009, 08:44 PM

الاجابات الصحيحة

اجابات الأسئلة الجديدة لليوم هي:

135- What is difference between platelet adhesion and platelet aggregation?
Platelet adhesion
التصاق الصفائح على سطح غير صفيحي , مثلا التصاقها مع الكولاجين او عامل فون ويلبراند .
Platelet aggregation
التصاق الصفائح بينها وبين بعض , Platelets to platelets joining

136- What is the role of thromboxane A2
Is a potent platelet activator, and is released from platelet after its activation and it activates other platelets as well ass inducing platelet aggregation

137- What does PFA-100 machine do

The PFA-100 is a platelet function analyser that aspirates blood in vitro from a blood specimen into disposable test cartridges through a microscopic aperture cut into a biologically active membrane at the end of a capillary. The membrane of the cartridges is coated with collagen and adenosine diphosphate (ADP) or collagen and epinephrine inducing a platelet plug to form which closes the aperture.
In summary it test platelet aggregation (a platelet function test, that detects qualitative platelet defects) with the platelet agonists collagen and ADP.
My best regards

**ashraf shaq** · 03-10-2009, 08:52 PM

الأسئلة الجديدة لليوم:

138- When hemoglobin equals 4 g/dl, then the angle of the spreader for blood film preparation should be:
A] Reduced
B] Increased
C] 45°
D] Not changed
E] Perpendicular with the blood film

139- Slow drying of blood film can be caused by:
A] Polycythemic blood samples
B] Anemic blood samples
C] Old blood samples
D] Films made from heparinized blood samples
E] Small blood drops

140- The anticoagulant of choice for coagulation tests is:
A] Sodium Citrate
B] Sodium Heparin
C] Sodium Fluoride
D] ACD
E] EDTA

موفقين يا رب

:sm199::sm199::sm199:

**hematologist** · 03-10-2009, 09:12 PM

138- B
139- B
140- A

**laboratories** · 03-10-2009, 09:52 PM

B
D
A

الله يعطيك العافية

**samah ahmed** · 03-10-2009, 10:02 PM

138/A
139/A
140/A

**m^rm^r** · 04-10-2009, 01:23 AM

B
A
A
--------------------------------

**Hearts PrincesS** · 04-10-2009, 01:39 AM

B
D
A

I wish that I was here from the bigin

thaaanx 4 these MCQ's

:sm188:

**عبدربه محمد الرقب** · 04-10-2009, 04:12 AM

الاجابات الصحيحة

138- B
139- B
140- A

**M.A** · 04-10-2009, 10:38 AM

138-B
139-B
140-E

**bhloool** · 04-10-2009, 10:59 AM

138-B
139-A
140-A

**الدكتور0078** · 04-10-2009, 12:35 PM

السؤال رقم 7 - a
السؤالرقم 8 - a

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