Hemostasis, Hemorrhagic Disorders, and Thrombosis

What is hemostasis?

• The process by which blood clots form at sites of vascular injury

• The process of breaking down blood clots

• The process of oxygen transport in blood

• The process of immune response

Fill in the blank: In hemorrhagic disorders, hemostatic mechanisms are either ______ or insufficient to prevent blood loss.

• blunted

• enhanced

• accelerated

• excessive

Which of the following best describes thrombotic disorders?

• Characterized by excessive bleeding

• Blood clots form within intact blood vessels or within the chambers of the heart

• Caused by immune system failure

• Related to oxygen deficiency

Thrombosis has a central role in the most common and clinically important forms of cardiovascular disease.

• True

• False

Hemostasis is a precisely orchestrated process involving _______, clotting factors, and endothelium that occurs at the site of vascular injury and culminates in the formation of a blood clot.

• platelets

• erythrocytes

• leukocytes

• plasma proteins

What is the immediate effect of arteriolar vasoconstriction at the site of vascular injury?

• It markedly reduces blood flow to the injured area.

• It increases the permeability of the vessel wall.

• It initiates platelet aggregation.

• It causes rapid clot dissolution.

Which factor is a potent endothelium-derived vasoconstrictor that may augment arteriolar vasoconstriction?

• Endothelin

• Nitric oxide

• Prostacyclin

• Bradykinin

Primary hemostasis involves the formation of which structure?

• The platelet plug

• The fibrin clot

• The red blood cell aggregate

• The white blood cell cluster

Disruption of the endothelium exposes which two components that promote platelet adherence and activation?

• von Willebrand factor (vWF) and collagen

• Fibrinogen and thrombin

• Serotonin and histamine

• Prostacyclin and nitric oxide

Secondary hemostasis involves the deposition of which protein?

• Fibrin

• Albumin

• Collagen

• Keratin