Classification Of Nerve Fibers

The correct answer is A Fiber because myelinated fibers with larger diameters have faster conduction speeds. Since the average impulse speed is 130 meters per second, it indicates that the fiber is myelinated and has a larger diameter. This type of fiber is responsible for transmitting sharp pain signals quickly.

C fibers are unmyelinated fibers with smaller diameter, which leads to a slower average impulse speed of 0.5 meters per second. This slower conduction velocity is associated with dull pain sensations. C fibers are responsible for transmitting slow, chronic, and throbbing pain signals, as opposed to the faster A fibers that transmit sharp, acute pain signals. Therefore, the given answer correctly identifies C fibers as the type of fiber associated with dull pain.

General Somatic Efferent Fibers conduct impulses from the central nervous system (CNS) to the voluntary structures. These fibers are responsible for carrying motor commands from the CNS to the skeletal muscles, allowing voluntary movement and control. They transmit signals that initiate muscle contraction and movement in response to conscious decisions made by the brain.

The correct answer is B Fiber because myelinated fibers with moderate diameter typically have an average impulse speed of 10 meters per second.

General Visceral Afferent Fibers conduct impulses from involuntary structures to the central nervous system (CNS). These fibers are responsible for transmitting sensory information from internal organs, such as the heart, lungs, and digestive system, to the CNS. This allows the body to monitor and regulate the functioning of these organs.

General Somatic Afferent Fibers conduct impulses from voluntary structures to the central nervous system (CNS). These fibers are responsible for transmitting sensory information from the skin, skeletal muscles, and joints to the CNS. They allow us to perceive sensations such as touch, pain, temperature, and proprioception.

General Visceral Efferent Fibers conduct impulses from the central nervous system (CNS) to the involuntary structures of the body. These fibers are responsible for transmitting motor signals to smooth muscles, cardiac muscles, and glands, controlling their involuntary functions such as digestion, heart rate, and secretion. Unlike General Somatic Efferent Fibers, which control voluntary movements of skeletal muscles, and General Visceral Afferent Fibers, which transmit sensory information from the internal organs to the CNS, General Visceral Efferent Fibers specifically regulate the autonomic functions of the body.