oo Sprint 7:14 PM Done Iss.pdf 1. How does the auditory system distinguish the v
ID: 65268 • Letter: O
Question
oo Sprint 7:14 PM Done Iss.pdf 1. How does the auditory system distinguish the volume of different sounds? Select all that apply Louder sounds result a higher frequency of actide polentials reaching the adany centers of the brain than softer sounds Louder sounds cause the release of more neurotransmiters from hair cells than soer Louder sounds cause action potentials with a higher peak vol age than sofer sonds. Louder sounds stimulate diferent parts of the auditory system than sofer sounds. Loud sounds cause vibration in one part of the basilar membrane, and sollt sounds cause ibration in a different part of the basilar membrane. Lcuder sounds cause stereocilia of hair cells to bend more than sofer sounds Changing the resting membrane potential of a neuron from-70 mV to -60 mV would 2. Stay the same Decrease Increase 3. Diagram A below shows a stimulus applied to a sensory cell, and diagram B is the pattem of action potentials generated in response. Diagram A Diagram B Such a pattern: improves the simultancous delection of two kinds of stimuli; for example, smell allows an animal to constantly measure the strength of a continuing input. C permits discrimination between different kinds of stimul C allows an animal to detect the onset of a new stimulus 4. If a neuron's voltage-gated K+ channels were blocked, the neuron Could not generale an action potentialExplanation / Answer
2. Changing the resting membrane potential from -70 to -60 mV increases the excitability.
3. Such pattern permits discrimination between two different stimuli.
4. Assuming sodium channels are functioning normally, there would still be an action potential. The threshold would be unaffected, because it is a property of sodium channels. A peak voltage will be reached when the sodium channels become inactivated; this voltage may be higher than normal since usually there is a partial canceling of the rising voltage as potassium exits. Without a potassium current, the falling phase would be much slower, being dependent on the sodium-potassium pump removing the sodium ions that came in. The undershoot would be absent because it is a result of potassium current.
The answer is would be able to return to resting potential after a action potential.
5. Atropine acts by preventing acetylcholine from depolarising the postsynaptic membrane and so prevents generation of the impulse in this cell.
So the answer is letter E
6. The logical explanation is Student A has normal saliva, but student B has more alkaline saliva.
7. The answer is depolarization of rod cell in the light inhibits the release of neurotransmitter.
8. The answer is the peak would occur over a longer period of time.
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