[Campbell Biology P.23] Based on Figure 49.8, which of the following statements accurately ... | Practice Question

Based on Figure 49.8, which of the following statements accurately describes a difference between the motor system and the autonomic nervous system?

  • A: The motor system utilizes two neurons to reach its target, while the autonomic system uses a single neuron.
  • B: Acetylcholine is the only neurotransmitter used in the motor system, whereas both Acetylcholine and Norepinephrine are used in the autonomic system.
  • C: The motor system targets smooth muscle and glands, while the autonomic system targets skeletal muscle.
  • D: The autonomic nervous system consists of a single neuron pathway from the CNS to the target, unlike the motor system.

Explanation

Figure 49.8's key to neurotransmitters indicates that the motor system's single neuron uses Acetylcholine. For the autonomic system, the sympathetic division's postganglionic neuron uses Norepinephrine, while the parasympathetic division's postganglionic neuron uses Acetylcholine. Thus, both neurotransmitters are found in the autonomic system, while only Acetylcholine is indicated for the motor system.