Final answer:
Cutaneous stimulation is the pain relief process involved when a nurse teaches a client acupressure, involving pressure application to specific body points to stimulate natural healing and promote pain relief.
Step-by-step explanation:
The process involved in the pain relief measure being taught by a nurse practitioner trained in acupressure is c) Cutaneous stimulation. Acupressure involves applying pressure to specific points on the body to relieve pain and promote health. This method functions by stimulating the body's own healing processes, including increasing blood flow to the area, releasing muscle tension, and potentially triggering the release of endorphins, which are natural pain-relieving chemicals in the brain.
While other pain relief mechanisms mentioned in the options, such as biofeedback mechanism, transcutaneous electrical nerve stimulation (TENS), and client-controlled analgesia are valid for different contexts, they are not the processes employed in acupressure. Nociceptors are the type of receptor cells responsible for transducing pain stimuli, which are not necessarily directly related to acupressure but are part of the broader understanding of pain mechanisms in the body.