Cytoplasmic fragments of megakaryocytes

• WBC

• platelets

• plasma

• RBC

granules in platelets contain serotonin, Ca, enzymes, ADP and platelet-derived growth factor that all aid in

• blood clotting

• inflamaation

• lymph production

Platelets form a ______ plug that helps seal breaks in blood vessels.

• permanent

• temporary

What keeps circulating platelets inactive and mobile?

• macrophages

• RBC

• nitric oxide (NO)

• prostacyclin

Vasodilator

• NO (nitric oxide)

• prostacyclin

come from endothelial cells lining blood vessels

• nitric oxide (NO)

• prostacyclin

How long do platelets last before degredation?

• 15 days

• 90 days

• 10 days

• 30 days

platelet formation is regulated by

• NO

• prostacyclin

• thrombopoietin

• potassium

to "stop blood flow"

• thrombo

• hemostasis

• platelets

A fast series of reactions for stopping bleeding.

• hemostasis

• not this