I fell and scraped my knee, now it's bleeding and my body is performing a positive feedback loop to form a blood clot from the wound
the receptors in my knee are sending an afferent to my brain
after that, my brain will send an efferent to my effector so that it's able to form a blood clot and stop my knee from bleeding, as well as protecting the wound
this positive feedback loop will help my body to maintain homeostasis.