17. The Blood
Platelets: Hemostasis
17. The Blood
Platelets: Hemostasis
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- Multiple Choice
Platelets are similar to erythrocytes in that both structures do not contain a _________________. Platelets are similar to leukocytes in that both their primary functions involve ________________ the body.
- Multiple Choice
Which physiological response causes a reduction in blood flow immediately after a blood vessel injury?
- Multiple Choice
Which of the following statements about vascular spasms is false?
- Multiple Choice
Prostacyclin is a hormone that is normally active in the blood but becomes inactive when a blood vessel ruptures and hemostasis begins. Considering this, which of the following is the most likely function of prostacyclin?
- Open QuestionThe following is a list of the phases involved in the process of hemostasis.1. coagulation2. fibrinolysis3. vascular spasm4. retraction5. platelet phaseThe correct sequence of these phases isa. 5, 1, 4, 2, 3,b. 3, 5, 1, 4, 2,c. 2, 3, 5, 1, 4,d. 3, 5, 4, 1, 2,e. 4, 3, 5, 2, 1.
- Open QuestionWhich of the following does not promote multiple steps in the clotting pathway?a. platelet phospholipids,b. factor XI,c. thrombin,d. Ca²⁺.
- Open QuestionMultiple ChoiceMore than one choice may apply.A condition resulting from thrombocytopenia isa. thrombus formation.b. embolus formation.c. petechiae.d. hemophilia.
- Open Question___and ____affect almost every aspect of the clotting process. (a) Calcium, vitamin K, (b) Calcium, vitamin B12,(c) Sodium, vitamin K, (d) Sodium, vitamin B12.