BIO2341-17.5 Platelets are cell fragments that help stop bleedi
(?) = platelets
(?) are large megakaryocyte fragments formed in RBM.
(?) = thrombopoietin
(?) regulates the formation of platelets
(?) = platelet-derived growth factor
"PDGF" stands for (?).
(?) = sinusoid
A/an (?) is the specialized type of capillary in the RBM.
(?) = sinusoid
After formation, the megakaryocyte presses against a/an (?).
(?) = bloodstream
After sticking to a sinusoid, the megakaryocyte sends cytoplasmic extensions through the sinusoid wall into the (?).
(?) = blue
In blood smears, each platelet exhibits a/an (?)-staining outer region.
(?) = purple
In blood smears, each platelet exhibits an inner, granule-containing area that stains (?).
(?) = repeated mitoses of the megakaryoblast
In platelet formation, (?) occurs, but cytokinesis does not.
(?) = NO and prostacyclin
Mobile but inactive (?) secreted by endothelial cells lining the blood vessels keep platelets mobile.
(?) = endothelial cells lining blood vessels
Mobile but inactive NO and prostacyclin secreted by (?) keep platelets mobile.
(?) = megakaryocytes
Platelets are cytoplasmic fragments of extraordinarily large cells called (?).
(?) = cytoplasmic extensions
After sticking to a sinusoid, the megakaryocyte sends (?) through the sinusoid wall into the bloodstream.
(?) = sinusoid wall
After sticking to a sinusoid, the megakaryocyte sends cytoplasmic extensions through the (?) into the bloodstream.
(?) = anucleate
Because they are (?), platelets age quickly.
(?) = quickly
Because they are anucleate, platelets age (?).
(?) = 150,000 to 400,000
Each microliter of blood contains (?) platelets.
(?) = cytokinesis
In platelet formation, repeated mitoses of the megakaryoblast occur but (?) do/does not.
(?) = inner
In platelets, granules are located in the (?) region.
(?) = 1/4
Platelets are (?) the diameter of lymphocytes.
(?) = lymphocytes
Platelets are 1/4 the diameter of lymphocytes.
(?) = plasma
Platelets are essential for the clotting process that occurs in (?) when blood vessels are ruptured or their lining is injured.
(?) = blood vessels are ruptures or their lining is injured
Platelets are essential for the clotting process that occurs in plasma when (?).
(?) = RBM
Platelets are formed in the (?).
(?) = clotting
Platelets are involved in (?).
(?) = 10 days
Platelets degenerate in (?) if not involved in clotting.
(?) = 2 to 4 µm
The average platelet is (?) in diameter.
(?) = large
The cytoplasmic mass of a megakaryocyte is (?).
(?) = clotting process
The granules contain an impressive array of chemicals that act in the (?).
(?) = megakaryocytes
The immediate ancestral cells of platelets are (?).
(?) = serotonin, Ca²⁺, various enzymes, EDP, and PDGF
The impressive array of clotting-involved chemicals include (?).
(?) = cytoplasmic extensions
The megakaryocyte's (?) rupture, releasing platelets into the blood.
(?) = huge and mutlilobed
The nucleus of a megakaryocyte is (?).
(?) = plasma membranes
Upon rupturing, the (?) associated with each megakaryocyte fragment seals around the platelets.
(?) = sticking to the damaged site
By (?), platelets temporarily plug and seal the break in blood vessel.
