IB Biology Exam Prep

Category - Biology

Which of the following best describes a difference between the peripheral nervous system and the central nervous system?
  1. Axons within the peripheral nervous system are longer since they must stretch from cell bodies in the ganglia located along the spine to their destinations in the tissues.
  2. Nerve cells that are located within the peripheral nervous system have many more dendrites than those that are located within the central nervous system.
  3. Synapses within the peripheral nervous system are electrical rather than chemical and so do not require the use of neurotransmitters to transmit information.
  4. Impulses in the peripheral nervous system carry information from the body to the brain, while those in the central nervous system carry it from the brain to the body.
Explanation
Correct Response: A. The central nervous system consists of the brain and spinal cord. The nerves of the peripheral nervous system originate in or near the central nervous system and extend to the different regions of the body. Because of this, the axons in the peripheral nervous system must be longer. Dendrites are the extensions of a nerve cell that receive signals from other nerve cells. The nerve cells within the peripheral nervous system do not have significantly more dendrites than those located in the central nervous system (B). Synapses in the central and the peripheral nervous system both use neurotransmitters to transmit chemical signals (C). Impulses in the peripheral nervous system flow both to and from the central nervous system (D).
Was this helpful? Upvote!
Login to contribute your own answer or details

Top questions

Related questions

Most popular on PracticeQuiz