SOLVED

1.______________ nerves carry impulses away from the central nervous system. A. Sensory B. Motor C. Afferent D. Involuntary 2.A number of trends have been identified that have become progressively more pronounced as nervous systems evolved greater complexity. From the list below, choose the item that is not one of these trends. A. More sophisticated sensory systems B. Differentiation of sensory and motor nerves C. Elaboration of the brain D. All of these are among the major evolutionary trends. 3.Cells that insulate and speed impulse conduction down neurons in the PNS are: A. nodes of Ranvier B. astrocytes C. Schwann cells D. oligodendrocytes 4.A nerve impulse is initiated when: A. a reversal in the polarized state of the cell causes it to reach action potential B. physical disruption of the cell membrane causes some of its contents, including ions, to leak out C. the Schwann cells move into their new position D. voltage-gated channels close 5.Acetylcholine is a neurotransmitter which forms an excitatory synapse in ____ muscle and an inhibitory synapse in _____ muscle. A. smooth; skeletal B. skeletal; cardiac C. cardiac; skeletal D. skeletal; smooth  Â