Platelets Flashcards
1
Q
describe the platelets shape
A
irregular–small amount of cytoplasm surrounded by a membrane
2
Q
platelets arise from?
A
from the megakaryocyte
3
Q
what is the function of the platelets?
A
in hemostasis (blood clot)/(stop bleeding)
4
Q
what are the two cytoplasmic zones in the platelets?
A
- hyalomere (outer zone)–cytoskeletal fibers
2. granulomere (inner zone)–organelles and vesicles
5
Q
describe the cytoskeletal fibers
A
it’s the microtubual and microfilaments
6
Q
platelets also have?
A
serotonin
7
Q
explain platelets and serotonin
A
- adhere to damaged wall
- when contracting collagen within a wall the platelets will stick and swell
- platelet plug
- prothrombin to thrombin
- fibrinogen to fibrin
- clot retraction
8
Q
serotonin is a potent for what?
A
vassal constrictor (slows the bleeding)
9
Q
how often are platelets replaced in your body?
A
every 10 days
