Which sensation is initiated by the impulse from naked nerve endings?

The correct answer is Pain

Concept:

• Naked nerve endings, also known as free nerve endings, are unencapsulated nerve endings found in the skin, muscles, joints, and other tissues.
• These nerve endings are specialized to detect a variety of sensations, including pain, temperature (both hot and cold), and certain types of touch.
• Pain is the primary sensation initiated by impulses from naked nerve endings. This is a protective mechanism designed to alert the body to potential harm or injury.
• The pain signals are transmitted by specialized nerve fibers, such as A-delta fibers (for sharp, immediate pain) and C fibers (for dull, lingering pain).

Other Options:

• Smell: The sensation of smell is detected by specialized sensory neurons in the olfactory epithelium of the nasal cavity, not by naked nerve endings. These neurons respond to chemical molecules in the air, which bind to olfactory receptors and generate signals sent to the brain's olfactory bulb.
• Touch: Touch is primarily detected by encapsulated nerve endings, such as Meissner's corpuscles and Merkel discs, which are sensitive to light touch and pressure.
• Cold: Cold sensations are detected by specialized thermoreceptors, such as Krause end bulbs, and certain free nerve endings.