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- Stellate cells initially process sensory input to the cortex, whereas pyramidal cells send fibers from the cortex to terminate on efferent motor neurons. (True or false)when a stimulus is applied for a prolonged period the rate of receptor discharge slowsResting potential is a balance across the axon membrane between______forces moving ions out of the cell and ______forces operating to keep ions in the cell.
- A specific stimulus produces a receptor potential by :-a- inhibiting Na + influx into receptorb- inhibiting K + efflux from receptorc- enhancing Na + influx into receptord- enhancing K + efflux from receptorwith creative freedom illustarte the events of resting potential, depolirization and repolirisation of an axon membrane.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 potential
- Blocking KCa2 (SK) channels will typically ________ a neuron's firing rate Increase Decrease Not changeA ________ potentail is a local, graded depolarization in a receptor cell triggered by the threshold stmulus opening the ion channels generator graded action positiveThe two-neuron chain allows increased communication and control of the effector organ. A. True B. False
- For a second action potential to be fired an ......threshold must be reached......... the absolute refractory period. Choice A. Lower, after B. Lower, before C. Higher, during D. Higher, afterSense of smell, also known as olfaction, is the ability to perceive and interpret odours. When a chemical molecule interacts with an odour-receptor protein located on the sensory neuron in the nose, an action potential is triggered and sent along the axon. The interaction between a chemical molecule and an odour-receptor protein will first initiate the movement of _____A______ ______B_____ the _____C______ of the _____D_____ neuron. Using the numbers given below, identify A to D. A B C D Chlorine ions Potassium ions Sodium ions Into Out of Axon Dendrite Axon terminal Nodes of Ranvier Interneuron Motor neuron Sensory neuron A: AnswerB: AnswerC: AnswerD: AnswerDuring an EPSP, the _____ gates in the membrane open. During an IPSP, the _____ gates open. a. sodium . . . potassium or chloride b. potassium . . . sodium or chloride c. chloride . . . sodium or potassium