sympathetic nervous sYstem. d. none of the above.

1. Which of the following divisions of the nervous system is first to transmit sensory information from muscles and visceral organs? A. afferent division of the PNS B. efferent division of the PNS C. efferent division of the CNS D. afferent division of the CNS 2. These neuroglial cells cover CNS axons with myelin. A. satellite cells B.astrocytes C.oligodendrocytes D.Schwann cells

3.single choice Which part of the nervous reflex is fatigable. A. synapse B. sensory receptors C. afferent neuron D. efferent neuron E. effector 4.multiple choice The factors that influence the AP conduction velocity on nerve fiber include A. thickness of the myelin shealth. B. myelinated or not C. diameter of the fiber D. temperature E. strength of the stimulation 5.single choice Which property could be destroyed by the local anesthetics procaine (普鲁卡因). A. physiological integrity B. structure integrity C. insulation D. infatigable 6.single choice Which of the following is not the chemical mediated signal transmission. A. gap junction B. neuro-muscular junction. C. hormone binding with the receptor on the target. D. classical synapse E. varicosity 7.single choice In the nerve reflex, the latency from the stimulation to the response is mainly dependent on A. the number of synapses in the central nervous system. B. the action potential…

A nerve that contains fibers that send as well as receive messages is called aa. sensory nerve.b. afferent nerve.c. efferent nerve.d. mixed nerve.

17. Which of the following is true of spinal nerves? A. They originate at in areas of the brain. B. They carry only sensory fibers. C. There are 31 pairs, and all are mixed nerves. 18. Defects in the valves of the heart can often be detected by the presence of A. palpitations. B. murmurs. C. angina pectoris. ____ 19. The olfactory nerve (cranial nerve I) is responsible for the sense of A. smell. B. sight. C. touch.

Why is it difficult to identify the cause of many nervous system disorders? a. The genes associated with the diseases are not known. b. There are no obvious defects in brain structure. c. The onset and display of symptoms varies between patients. d. all of the above

1b) The process of myelination results in an increase in white matter. Myelination happens for all brain regions. Because of increases in myelination i. At different times; neural signals can travel through the brain faster ii. At different times; neurogenesis is improved iii. At the same time; neurogenesis is improved iv. At the same time; neural signals can travel through the brain faster 1c) Which of the following is an illustration of experience-dependent plasticity? i. Rats raised in cages with toys have more dendritic spines and more synapses per neuron than rats raised in cages without this stimulation ii. The brain expects experiences that all humans have (such as visual and auditory input) and uses them to shape the structure of the brain. iii. Adults who became blind early in life were better able to discriminate musical pitch than were those who became blind later in life. iv. All of the above

2) The central nervous system (CNS) is composed ofa. spinal nerves.b. sense receptors.c. the brain and spinal cord.d. nerves of the internal organs.

The thoracic spinal cord has the smallest dorsal horn area because:        a. the trunk is the most innervated area of the body and therefore there are more projections into the dorsal horn there.        b. the trunk is the least innervated area of the body and therefore there are fewer projections into the dorsal horn there.        c. most of the descending upper motor neurons have already entered the ventral horn.      d. There are many motor neurons to control the small muscles around the spine.

12) The part of the brain that connects the two hemispheres of the cerebrum and carries information between the hemispheres is thea. pons.b. medulla.c. cerebellum.d. corpus callosum.