Question

multiple choice question
in initiating hemostasis, what typically activates platelets?

• reticulocyte activating factor
• exposed collagen
• low oxygen concentrations

Explanation:

When a blood - vessel is damaged, the underlying collagen is exposed. Platelets have receptors that bind to exposed collagen, which activates them and initiates the process of hemostasis. There is no such thing as reticulocyte activating factor in the context of platelet activation for hemostasis, and low oxygen concentrations do not directly activate platelets in the initiation of hemostasis.

Answer:

Exposed collagen