It is accurate to say that neural transmission across nearly all mammalian synaptic clefts is the result of A)neural impulses involving the flow of K⁺ and Na⁺ across the cleft. B)neural impulses traveling across the gap as electrical currents. C)neural impulses causing the release of chemicals that diffuse across the cleft. D)neural impulses traveling across the cleft in both directions. E)the calcium within the axons and dendrites of nerves adjacent to a synapse acting as the neurotransmitter.

Question

Quizplus · Accepted Answer

The majority of neural transmission is mediated through the release of chemical neurotransmitters that diffuse across the synaptic cleft and bind to receptors on the postsynaptic membrane, stimulating or inhibiting neural activity. Electrical currents and specific ion flows noted in choices A and B play a role in the process, but are not the primary mechanism for transmission. Choice D is incorrect, as impulses typically travel in one direction across the synaptic cleft. Choice E is also incorrect, as calcium ions are not neurotransmitters; they have a role in the release of neurotransmitters, but do not themselves participate in transmission across the cleft.

It Is Accurate to Say That Neural Transmission Across Nearly