Case Study: Muscular Disorder Wearing on Her NervesPart 1:1. What components of the nervous system are involved in physical sensation? How does sensory impulse move throughout the body? The part of the nervous system that is involved in physical sensations is the peripheral nervous system. This includes nerves outside the spinal cord and brain that perceive different sensations. Sensory impulses move throughout the body by first registering a stimulus, which then sends the information to the spinal cord. From the spinal cord, it goes to the medulla, where it crosses over. Then it goes to the midbrain, then the thalamus, and finally primary somatosensory cortex. Sensory receptors also help move sensory impulses throughout the body.2. What components of the nervous system are involved in skeletal muscle movement? How does motor impulse move throughout the body? What is a “motor unit”? The somatic nervous system as well as motor neurons control voluntary muscle movements. Motor impulses move from the motor cortex down to the spinal cord and out to the muscles. A motor unit is the functional unit of the muscle that helps with contraction and includes a motor neuron, a neuromuscular junction, and muscle fiber.3. What movements are involved in the action of standing up? What muscles need to contract to perform these actions? The act of standing up involves the lower muscles of the body, including the legs and lower back and stomach. In order to stand, we have to extend our knees from a flexion position. When we stand, the muscles that contract are the quadriceps, hamstrings, gastrocnemius, abdominals, oblique’s, and gluteus maximus.