Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
chapter 17
blood
| Question | Answer |
|---|---|
| cytoplasmic fragments of megakaryocytes | platelets |
| platelets are cytoplasmic fragments of ______ | magakaryocytes |
| true or false: normal platelet count is 150,000-400,000 ml of blood | true |
| the function of platelets is to form temporary platelet plug that helps seals break in _______ | blood vessels |
| circulating platelets are kept inactive and mobile by _____ and prostacyclin from endothelial cells lining blood vessels | nitric oxide |
| platelet formation is regulated by ________ | thrombopoietin |
| true or false: platelets age quickly and degenerate in about 10 days | true |
| hemostasis, the fast series of reaction for stoppage of bleeding requires ______ and substances released by platelets and injured tissues | clotting factors |
| platelets stick to ______ that are exposed when vessel is damaged | collagen fibers |
| why don't platelets stick to intact vessel walls | because collagen is not exposed |
| secreted by endothelial cells that act to prevent platelet sticking | prostacyclins and nitric oxide |
| what chemical messengers are released by activated platelets? | ADP and serotinin |
| chemical messenger released by activated platelets causes more platelets to stick and release their contents | ADP |
| chemical messenger released by activated platelets enhances vascular spasm and platelet aggregation | serotonin and thromboxane A2 |
| why is platelet formation an example of positive feedback cycle? | as more platelets stick, they release more chemical, which cause more platelets to stick and release more chemicals |
| reinforces platelet plug with fibrin threads | coagulation |
| effective in sealing larger vessel breaks | blood clots |
| during coagulation _____ is transformed from liquid to gel | blood |
| disorder of hemostasis that results in undesirable clot formation | thromboembolic disorder |
| disorder of hemostasis abnormalities that prevent normal clot formation | bleeding disorders |
| involves both thromboembolic and bleeding disorders | disseminated intravascular coagulation |
| clot that develops and persists in unbroken blood vessel may block circulation, leading to tissue death | thrombus |
| thrombus freely floating in bloodstream | embolus |
| embolus obstructing a vessel | embolism |
| pulmonary or cerebral emboli would be an example of which bleeding disorder | embolism |
| risk factors: atherosclerosis, inflammation, slowly flowing blood or blood stasis from immbolity | thrombi and emboli |
| thrombocytopenia, a bleeding disorder is characterized by a deficient number of _______ | circulating platelets |
| thrombocytopenia is due to suppression or destruction of ______ | red bone marrow |
| impaired liver function: inability to synthesize ______ (clotting factors) | procoagulants |
| causes of ______ include vitamin K deficiency, hepatitis, or cirrhosis | impaired liver function |
| liver disease can also prevent liver from producing _____, which is needed to absorb fat and vitamin K | bile |
| symptoms include prolonged bleeding, especially into joint cavitites | hemophilia |
| widespread clotting occurs in intact ______, blocking blood flow | blood vessels |
| disseminated intravascular coagulation | |
| _____ antigens are referred to as agglutinogens because they promote agglutination | RBC |
| humans have at least _____ naturally occurring RBC antigens | 30 |
| erythroblastosis fetalis only occurs in Rh- mom with _____ fetus | Rh+ |
| true or false: during secondary pregnancy, Moms anti-Rh antibodies can cross placenta and destroy RBCs of Rh+ baby | true |
Created by:
alexx0593
Popular Biology sets