Скачать или смотреть Hemostasis | The Cardiovascular System | Unit 4: Fluids and Transport

Hemostasis is the physiological process by which bleeding ceases. Hemostasis involves
three basic steps: vascular spasm, the formation of a platelet plug, and coagulation, in
which clotting factors promote the formation of a fibrin clot. Fibrinolysis is the
process in which a clot is degraded in a healing vessel. Anticoagulants are substances
that oppose coagulation. They are important in limiting the extent and duration of
clotting. Inadequate clotting can result from too few platelets, or inadequate production
of clotting factors, for instance, in the genetic disorder hemophilia. Excessive
clotting, called thrombosis, can be caused by excessive numbers of platelets. A thrombus
is a collection of fibrin, platelets, and erythrocytes that has accumulated along the
lining of a blood vessel, whereas an embolus is a thrombus that has broken free from the
vessel wall and is circulating in the bloodstream.

00:00 Hemostasis
00:37 Vascular spasm
01:37 Formation of the platelet plug
03:15 Coagulation
03:55 Clotting factors involved in coagulation
05:53 Extrinsic pathway
06:47 Intrinsic pathway
08:32 Common pathway
09:20 Fibrinolysis
10:38 Plasma anticoagulants
11:53 Disorders of clotting
18:31 Chapter review


Attribution: OpenStax, Anatomy & Physiology Book
https://openstax.org/books/anatomy-an...