Problem Set: Chapter 29 #3
If a nerve impulse is traveling from the central nervous system to the organs of the body, the impulse would be traveling on a: Ainterneuron. Bsensory neuron. Cmotor neuron. Dganglion. Eall of the above
C
Which of the following occurs during the absolute refractory period? A. Sodium channels open, releasing sodium ions into the neuron; potassium channels close. B. Potassium channels open, releasing potassium ions from the neuron; sodium channels close. C. The neuron cannot generate an action potential. D. Sodium and potassium channels open. E. A nerve impulse is propagated.
C
Amyotrophic lateral sclerosis (ALS is a disease that results from nerve damage in the: A. diaphragm. B. intercostal muscles. C. sensory nerves. D. spinal cord. E. brain.
D
Insufficient production of acetylcholine in the synapses of the brain, abnormal tangled neurons, and large deposits of beta amyloid are problems associated with: A. meningitis. B. rabies. C. epilepsy. D. Alzheimer's disease. E. Parkinson's disease.
D
Oligodendrocytes are similar to Schwann cells in that they: A. help neurons regenerate after injury. B. conduct nerve impulses. C. are located in the peripheral nervous system. D. are a type of neuroglial cell. E. are located in the central nervous system.
D
Which of the following events associated with the transmission of an impulse across a synapse occurs last? A. neurotransmitter is released into synaptic cleft B. neurotransmitter binds to receptors on postsynaptic membrane C. calcium diffuses into an axon bulb D. chemically gated channels for sodium open E. action potential arrives at an axon bulb
D
Which of the following is not true regarding the sodium-potassium pump? A. The sodium-potassium pump is very important in establishing the electrical charge across the cell membrane of a neuron. B. In each exchange of ions, the sodium-potassium pump removes three sodium ions from a neuron and takes in 2 potassium ions. C. In a resting neuron, activities of the sodium-potassium pump result in a resting membrane potential of -70 millivolts. D. Due to actions of the sodium-potassium pump, the charge of the cytoplasm of a neuron is slightly more positive than the charge of the interstitial fluid surrounding it. E. Due to actions of the sodium-potassium pump, the concentration of sodium is higher outside a neuron than inside a neuron when the neuron is at rest.
D
Which of the following is a true statement regarding the synapse? A. Binding of the neurotransmitter to the postsynaptic neuron results in the release of magnesium into the synaptic cleft. B. Neurotransmitters are stored in the dendrites of the postsynaptic neuron. C. Release of a neurotransmitter results in an action potential on the presynaptic neuron. D. Once released from the postsynaptic neuron, the neurotransmitter will diffuse across the synaptic cleft and bind to the presynaptic neuron. E. The synaptic cleft is a fluid-filled gap located between the presynaptic neuron and the postsynaptic neuron.
E
A student noticed that every time he smelled a certain perfume in the hallway, it reminded him of his mother. This is due largely to the activity of the limbic system.
TRUE
The absolute refractory period characteristic of neurons is important in ensuring that action potentials travel in only one direction. (KNOW FOR FINAL EXAM.)
TRUE
The two subdivisions of the nervous system are the central nervous system and the peripheral nervous system.
TRUE
During which of the following phases of an action potential do the sodium channels close and potassium channels open, releasing potassium from the neuron? A. saltatory propagation B. both depolarization and repolarization C. reestablishment of resting potential D. depolarization E. repolarization
E
The nucleus and most of the organelles of a neuron are located in the dendrites.
FALSE
