Respuesta :
Answer:
In skeletal muscle, stretching activates the muscle spindle, increasing the rate of action potentials (APs). Option 'a' is correct.
Explanation:
The muscle spindle is a sensory receptor located within skeletal muscle fibers. Its primary function is to detect changes in muscle length and the rate of change in length. When the muscle is stretched, the muscle spindle is activated and sends signals to the central nervous system (CNS) through sensory nerve fibers.
The sensory nerve fibers from the muscle spindle transmit the information about muscle stretch to the CNS. This information is then processed, and the CNS responds by increasing the rate of action potentials (APs) sent to the muscle fibers.
The increased rate of APs leads to an increased contraction of the muscle. This mechanism helps to prevent overstretching of the muscle and provides a protective reflex response, commonly known as the stretch reflex. The stretch reflex helps to maintain muscle tone and stabilize joints.
For example, when you stretch your quadriceps muscle (located in the front of your thigh), the muscle spindle in the muscle fibers detects the stretch. The sensory signals from the muscle spindle travel to the CNS, which then sends back signals to increase the rate of action potentials in the quadriceps muscle, causing it to contract and resist further stretching.
In summary, in skeletal muscle, stretching activates the muscle spindle, which in turn increases the rate of action potentials. This mechanism helps to protect the muscle from overstretching and plays a role in maintaining muscle tone and stability.
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