14) The Nodes of Ranvier are: a. sites of neurotransmitter storage. b. where the

Question

14) The Nodes of Ranvier are: a. sites of neurotransmitter storage. b. where the nucleus of a neuron is located. c. gaps in the myelin sheath. d. sites of myelin production. 15) Most neurons are: a) efferent neurons. b) Motor neurons c) Interneurons d) Afferent neurons 16) Which of the following would be considered a visceral effector of the autonomic nervous system? a. Brain b. Spinal cord c. Cardiac muscle d. Skeletal muscle 17) ALL of the following are TRUE concerning graded potentials EXCEPT: a. b. c. d. they transmit nerve impulses over long distances. they may be hyperpolarizing or depolarizing they arise in dendrites. their amplitude depends of the strength of the stimulus. 18) Efferent (motor) neurons transmit impulses from: a. the CNS to effectors. b. receptors to the CNS c. the CNS to receptors. d. effectors to the CNS 19) During the repolarization phase of an action potential, which of the following is the primary activity a. Potassium ions (K') are flowing into the neuron. b. Potassium ions (K') are flowing out of the neuron. c. Sodium (Na") ions are flowing into the neuron. d. Sodium ions (Na") are flowing out of the neuron.

Explanation / Answer

14. c) gap between two mylein sheath

15. c) internuerons

16. c) cardic mucles because visceral effector is intervention of smooth muscles, caediac muscles and gland cells.

17. c) they arise from dendrites

18. a) from CNS to effector

19. b) potassium ions are flowing out of the nueron results in repolarization.

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