NURSING 101Chapter 15: Structure and Function of the Neurologic System

. Which pathway carries sensory information toward the central nervous system (CNS)? a. Ascending c. Somatic b. Descending d. Efferent ANS: A Peripheral nerve pathways can be afferent (ascending) pathways that carry sensory impulses toward the CNS. The remaining options do not carry sensory information to the CNS. PTS: 1 REF: Page 448 2. Which type of axon transmits a nerve impulse at the highest rate? a. Large nonmyelinated c. Small nonmyelinated b. Large myelinated d. Small myelinated ANS: B If the myelin layer is tightly wrapped many times around the axon and is forming the nodes of Ranvier, then conduction velocity increases and the neuron is referred to as myelinated. The increased diameter of the myelinated axons allows for the transmission of impulses at a faster rate. The other options do not affect nervous impulse transmission rates. PTS: 1 REF: Pages 448-450 3. Which nerves are capable of regeneration? a. Nerves within the brain and spinal cord b. Peripheral nerves that are cut or severed c. Myelinated nerves in the peripheral nervous system d. Unmyelinated nerves of the peripheral nervous system