Question

The human body uses a number of processes to repair damage to blood vessels. After vasodilatation and prior to coagulation, a platelet plug forms: platelets adhere to exposed collagen and degranulate releasing ADP and thromboxane. These two chemicals in turn help attract more platelets to the area of damage. This is an example of: Group of answer choices negative feedback set-point regulation positive feedback endocrine control

Answer 1

Option C, positive feedback

Step-by-step explanation:

The process described in the question is known as Platelet plug formation. In this process, after the adherence of platelet, the collagen starts binding with the platelet’s receptor thereby by activating it. After activation, platelet releases cytokines and chemical mediators such as serotonin, coagulation factors, thromboxane A2, vascular endothelial growth factor, ADP, VWF etc. Both ADP and VWF are mainly responsible for adhering nearby platelets. This is positive feedback loop because the more and more platelets are adhered; the more and more ADP and VWF levels increase.

Option C is correct