SOLVED

101) Which of the following statements is true? A) Recent research suggests that stem cells in the brain may be able to generate new neurons throughout life. B) No new neurons are produced in the central nervous system after infancy. C) Neurogenesis occurs in the spinal cord but not in the brain. D) Injured or damaged neurons in the central nervous system can never regenerate. 102) Neuroscientists have found that ________ can inhibit the process of neurogenesis. A) melatonin B) stress C) endorphins D) nicotine 103) Neuroscientists have found that ________ can kill the new neurons that have been produced through neurogenesis. A) endorphins B) stress C) nicotine D) melatonin 104) Stem-cell research is exciting to scientists because it has the potential to: A) help people recover from brain injury. B) help people to recover from spinal cord damage. C) help people recover from brain diseases such as Alzheimer’s disease. D) do all of the above. 105) The authors point out that stem-cell research is hotly debated in Canada. Stem cells for research purposes are usually taken from: A) extra embryos about to be discarded by fertility clinics. B) the umbilical cord cells of newborns. C) the brains of human cadavers. D) the bone marrow of adult organs. 106) Throughout life, axons and dendrites continue to grow, and tiny projections on dendrites, called ________, increase in size and number. A) stem cells B) precursor cells C) spines D) axon terminals 107) Which of the following is true about synapses? A) The network of synaptic connections can change throughout childhood, but stops changing at adolescence. B) A single neuron may receive input from hundreds of other neurons. C) Once a synaptic connection is formed, it will not be lost unless the neuron itself dies. D) Each axon makes a synaptic connection with only one other neuron. 108) “Plasticity” means that: A) axons, like soft plastic, are flexible and can bend around obstacles to make synaptic connections. B) neurons have a myelin sheath, similar to a plastic shell, that surrounds them. C) people can compensate for brain damage by learning new ways to do things. D) synaptic connections can change throughout life. 109) “Pruning” refers to: A) the death of neurons that results when synaptic connections are lost. B) a loss of dendrites and synaptic connections that occurs as we age. C) a loss of dendrites and synaptic connections that occurs in certain degenerative diseases. D) a loss of unused synaptic connections that results in a more efficient neural network. 110) Which of the following is NOT included in the synapse? A) the synaptic cleft B) the receptor sites in the membrane of the receiving cell C) the axon terminal D) the axon of the receiving cell