Platelet agonists are substances that: a. Bind to phospholipid ...

[olgavictoria]

Platelet agonists are substances that:
 
  a. Bind to phospholipid in the platelet membrane
  b. Promote apoptosis
  c. Activate platelets
  d. Enhance megakaryocyte proliferation

Question 2

What system is responsible for controlling platelet activation?
 
  a. Eicosanoid (prostaglandin) pathway
  b. Surface connect canalicular system
  c. Membrane glycoproteins
  d. Dense tubular system

[Silverbeard98]

Answer to Question 1

ANS: C
Platelet agonists include thromboxane A2 (TXA2), ADP, and thrombin. Each of them binds to its transmembrane receptor, and platelet activation is the result.

Answer to Question 2

ANS: D
The dense tubular system is a condensed remnant of the rough endoplasmic reticulum. It sequesters Ca++ and bears a series of enzymes that support platelet activation. It is the control center for platelet activation.