SOLVED

111) The site where a nerve impulse is transmitted from one nerve cell to another is called the: A) action potential. B) precursor cell. C) synapse. D) myelinated axon. 112) Neurons in a newborn’s brain: A) are twice as numerous as glial cells. B) touch one another, end to end. C) are widely spaced, but immediately begin to form connections. D) are densely spaced, with complex connections. 113) ________ occurs when a brief change in electrical voltage takes place between the inside and the outside of an axon when a neuron is stimulated. A) Plasticity B) An action potential C) Neurogenesis D) Biofeedback 114) A brief change in electrical voltage in the neuron in response to stimulation is called a/an: A) action potential. B) synaptic charge. C) node. D) neurotransmission. 115) Action potentials result from an: A) inflow of potassium followed by an outflow of sodium. B) inflow of sodium followed by an outflow of potassium. C) outflow of positively charged potassium ions. D) inflow of positively charged sodium ions. 116) Action potentials travel swiftly down: A) dendrites with myelin and more slowly in dendrites without myelin. B) axons without myelin and more slowly in axons with myelin. C) dendrites without myelin and more slowly in dendrites with myelin. D) axons with myelin and more slowly in axons without myelin. 117) Nerve impulses travel more slowly in babies than in older children and adults because: A) dendrites have not yet developed spines in infants. B) the myelin sheaths on axons are not yet fully developed in infants. C) the infant does not have as many synaptic connections. D) axons are much shorter in infants. 118) When an action potential reaches the end of the axon terminal, it: A) reverses direction and returns to the cell body. B) causes synaptic vesicles to break open and release molecules of neurotransmitter. C) causes pores on the axon terminal to open and receive neurotransmitters from other neurons. D) hops across the synaptic cleft to the next neuron. 119) Researchers have found that: A) in unmyelinated axons, positively charged ions flow down the axon at a very fast rate, causing regeneration of the action potential at each node. B) when a nerve impulse reaches the axon terminal’s button-like tip, the action potential “hops” over to the receiving neuron’s dendrites. C) throughout life, unused synaptic connections are pruned away as cells or their branches die and are not replaced. D) in myelinated axons, the action potential at each point in the axon gives rise to a new action potential at the next point. 120) To prepare for her psychology test, Jendaya writes key points on index cards in order to quiz herself on neuronal communication. Which of the following would NOT be found on her study cards? A) A neuron’s axon may have hundreds or even thousands of terminals, and so the number of communication links in the nervous system runs into the trillions. B) Nerve impulses travel more quickly in babies than in older children because with age comes neuronal degeneration. C) When a nerve cell is stimulated, a change in electrical potential occurs between the inside and the outside of the cell. D) Throughout life, some unused synaptic connections are lost as cells or their branches die and are not replaced.