Practice Questions

Practice Questions - Practice Questions Test #2 1. Glial...

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Practice Questions Test #2 1. Glial cells are cells that a. send and receive information. b. provide nutrition and structural support for neurons. c. act as a bridge between the brain and spinal cord d. communicate information to the muscles and glands. 2. _____ neurons convey information about the environment from the sense organs to the brain, and _____ neurons communicate information to the muscles and glands. a. Dendritic; axonal b. Excitatory; inhibitory c. Sensory; motor d. Motor; sensory 3. The part of the neuron that sends messages to other neurons is called the a. axon. b. dendrite. c. nucleus d. sodium ion membrane e. potassium ion membrane 4. The primary function of the myelin sheath is to a. reduce the speed of neurotransmitters crossing the synaptic gap. b. increase the speed of neurotransmitters crossing the synaptic gap. c. increase the speed at which neurons conduct action potentials. d. provide support and nutrition to the dendrites. e. bundle together the axons of neurons that produce the same neurotransmitters. 5. Multiple sclerosis is a disease caused by a. degeneration of the myelin sheath, slowing or interrupting the transmission of neural messages. b. an abnormal increase in the thickness of the myelin sheath, blocking the release of neurotransmitters. c. multiple fractures in the sclerotic membrane, which causes the neuron’s cell body to collapse and die. d. dendrites becoming brittle and breaking. e. a decrease in the production of dopamine at the substantia nigra. 6. As a general rule, communication within a neuron progresses from a. the axon to the dendrites to the cell body. b. the dendrites to the cell body to the axon. c. the myelin to the nucleus to the dendrites. d. somatic to the autonomic. e. peripheral to the central and back to the peripheral. 7. Which of the following is TRUE regarding action potentials?
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a. Partial action potentials result in fewer neurotransmitter molecules being released than whole action potentials. b. Action potentials operate under the all-or-none law, which means the action potentials either move all sodium ions across the membrane or none of the sodium ions across the membrane. c. Once an action potential is started, it is self-sustaining and continues to the end of the axon. d. Action potentials regenerate themselves during their refractory periods when the axon membrane is depolarized. 8. The fastest neurons in the human body communicate their messages at a. the speed of light, or about 186,000 miles per second. b. speeds up to 200 miles per hour. c. the speed of sound, or about 770 miles per hour. d. the speed of electricity, or about 100 miles per second. e. only about 10 miles per hour. 9. Communication between neurons usually occurs across
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Practice Questions - Practice Questions Test #2 1. Glial...

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