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- Watch this video (http://openstaxcollege.org/l/3Dmovies) to learn about the side effects of 3-D movies. As discussed in this video, movies that are shot in 3-D can cause motion sickness, which elicits the autonomic symptoms of nausea and sweating. The disconnection between the perceived motion on the screen and the lack of any change in equilibrium stimulates these symptoms. Why do you think sitting close to the screen or right in the middle of the theater makes motion sickness during a 3-D movie worse?All afferent signals travel what direction? O None of these is correct O Toward a muscle O Toward the CNS O Away from the CNS O Toward a glandIf your body was transmitting a signal between hemispheres of the brain, the signal would travel O along a longitudinal fiber O on an axon in the corpus callosum O along a projection fiber along an arcuate fiber
- Where does an axon potential begin on an axon? O the action-potential initiating hillock (APIH) O the first node of Ranvier O the bouton segmentalis O the axon initial segment (AIS) O the first axon-collateral segment (ACS)Receptor potential initiated by an adequate stimulus :-a- develops always at it full magnitudesb- undergoes temporal summation onlyc- undergoes spatial summation onlyd- could initiate an action potentialWng Why do elinated asons Conduct action potentials Faster than asons P unmyelinated
- The giant axon of the squid (Figure Q11–3) occu-pies a unique position in the history of our understandingof cell membrane potentials and nerve action. When anelectrode is stuck into an intact giant axon, the membranepotential registers –70 mV. When the axon, suspended in abath of seawater, is stimulated to conduct a nerve impulse,the membrane potential changes transiently from –70 mVto +40 mV.ахon transmits information away from the cell body (centrifugal) and that ends by the terminal arborization. Only axons are surrounded by a myelin sheath. to the cell body (centripetal) and the axon that PROBI NG Ithe ACTIVITY What are the structural constituents of the gray matter, the white matter, and the nerve? Draw a neuron then use the different documents of the activity to determine, on the figure, t location of each part of the neuron in the nervous system. Using docs a, b, and c, draw and label a transverse section of the spinal cord, a cell body, a transverse section of a nerve.In general, the single nerve fiber is receiving the stimuli from. . O Surrounding neuroglial cells O Directly from dendrites of the same neuron O The axon of the same neural cell O Directly from the soma
- A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b NextWhen stimulated by effective steady stimuli, sensory receptors :-a- continuously discharge impulsesb- stop discharging after a short timec- produce an initial high rate of impulse discharge followed by decline of this rated- differ in their response ; some types discharge continuously, while other types do not respond at allThe conduction velocity in nerves is primarily dependent on the O localization of the Na+ / K+ pumps intensity and duration of the stimulus myelination and fiber diameter O fiber length and myelination O fiber length and fiber diameter
