anesthetic drugs such as Xylocaine and Novocain work by blocking a. sodium chann
ID: 3449596 • Letter: A
Question
anesthetic drugs such as Xylocaine and Novocain work by blocking a. sodium channels. b. chloride channels. c. potassium channels. d. second messengers. law? 17. Which of the following is concepts is described by the all-or-none must be hyperpolarized before a eurons in a nerve fiber fire or none of them fires a. All dendrites be action tribrane potential does not reach the thresh triggered e te nurons in a nerve fiber fire or none Idoes not reach the threshold value, no action potential is d. The frequency at neuron Which a neuron fires is independent of the intensity of the stimulus. 18. Where can sodium ions enter a myelinated axon? a. at the soma b. through the myelin sheath c. at the nodes of Ranvier d. at the point at which the axon divides and a ar urtsmitter from axon terminals into the synaptic cleft a. an influx of chloride ions. b. the opening of nodes of Ranvier. reversal of the sodium-potassium pump d, c. the o entry of calcium ions from the extracellular fluid. 20. If different postsynaptic potentials occur at the same time but at different locations, then is occurring. a. temporal summation b. simultaneous summation c. spatial summation d. synaptic summation 21. The illness. has a weaker blood-brain barrier to better detect food toxins which may cause a. amygdala b. pons c. area postrema d. insula 22. Both mirror and von Economo neurons seem to be involved in a. "gut feelings" and intuition. b. facial recognition. c. anticipating the actions of others d. sensory gating.Explanation / Answer
16. The correct answer is Option A. Local anesthetics block sodium channels.
17. The correct answer is Option C. If the membrane potential does not reach the threshold value, no action potential is triggered.
18. The correct answer is Option C. The sodium ions can enter a myelinated axon at the nodes of Ranvier.
19. The correct answer is Option D. The influx of calcium results in the release of neurotransmitters into the synaptic cleft.
Please post the other questions separately as we are supposed to answer just one question or four sub parts of a question.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.