Dina walks out the door and a blast of cold air greets her. she goes back into her house and puts a coat on. what is the stimulus, the sensory receptor, and the response in the scenario?

The stimulus in the situation is the cold air, this is what incites Dina to return to her house to put a coat on.
The sensory receptors are thermoreceptors, part of the exteroceptors located in the skin (exteroceptive sensitivity).
The response to the stimulus was elaborated by the somatic nervous system (which controls voluntary movements), and it was putting a coat to cover herself from the cold air, by returning at home getting it.

The 3 steps are vasoconstriction, temporary blockage of a platelet plug, formation of a fibrin clot better known as coagulation.

It forms into a full nebula/star