16. Lateral inhibition is best described as a process which: a. reduces calcium
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16. Lateral inhibition is best described as a process which: a. reduces calcium influx at the nerve terminal b. reduces activity of autonomic nerves c. reduces signals from nearby mechanoreceptors in the skin d. reduces the function of myelin 17. The arrows below represent the various changes in membrane potential. The arrow labeled 'x' is called: a. depolarization b. hyperpolarization c. repolarization d. overshoot Romng potential 90- Timc 18. The electroencephalogram (EEG) is a direct recording of: a. action potentials in the head b. synaptic potentials in the head c. movements of the head d. the amount of neurotransmitter in the head e. a and bExplanation / Answer
16.c.Lateral inhibition is the phenomenon in which a neuron's response to a stimulus is inhibited by the excitation of a neighboring neuron. lateral inhibition also takes place in the integumentary system via cutaneous mechanoreceptors, allowing a stimulus to be magnified on the skin.
17. This is representing repolarization as the resting membrane potential of a membrane is about -70mv and once the action potential has reached it caues depolarization and the membrane potential becomes positive. The arrow which shows X region shows repolarization as now once again the membrane potential becomes negative and reaches to -70mv.
18. When neurotransmitters bind to the receptors on the postsynaptic neuron, it causes the ion channel to open or close causing postsynaptic potentials. These are longer in duration than action potentials. They are generally confined to the dendrites of a neuron and occur instantaneously. Thus postsynaptic potentials can be summated and contribute to EEG.
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