Final answer:
The pain from a blow to the head is transmitted by A-delta fibers, which are fast-conducting sensory nerves responsible for conveying sharp, immediate pain. Nociception responds to injured stimuli, detecting potential tissue damage.
Step-by-step explanation:
The pain from a sudden blow to the head is transmitted by the A-delta fibers. These fibers are responsible for transmitting the initial sharp pain that is often experienced immediately after such an injury. The A-delta fibers are a type of sensory nerve fiber that are fast-conducting due to their myelination and they provide rapid pain signals to the brain.
Regarding the related question on nociception, which is the process of pain detection by the nervous system, nociception responds to injured stimuli. Nociceptors are the sensory receptors for painful stimuli, and they respond to various forms of damage or potential damage to tissues, such as cuts, burns, and inflammation.