The correct answer is letter A. Pain receptor - tissue injury. Nociception refers to the processing of harmful stimuli in the nervous system. The nociceptors are also known as "Pain receptor" that responds only to tissue damages cause by either mechanical, thermal stimulation.
7 isnt an option? i guess go for 6 hope this helped :)
All the arteries and veins outside the heart<span> and head </span>make up<span> the peripheral vascular </span>system<span>.
Hope this helps!!!:)</span>