True or False: Most synapses rely on electrical impulses instead of chemical impulses. True False
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(a) Most synaptic inputs to neurons are on the cell body. TRUE / FALSE (b) The site where an AP is triggered in a neuron is normally the cell body. TRUE / FALSE (c) Current flows from the synaptic input site to the AP trigger zone are regenerative. TRUE / FALSE (d) EPSPs & IPSPs decay with distance from the synaptic input site. TRUE / FALSE (e) The effectiveness of different synaptic inputs can vary depending on their proximity to the post-synaptic neuron's myelin sheath. TRUE / FALSE. (f) The closer a synapse is to the AP trigger zone on the post-synaptic cell, the more effective the synaptic current will be in influencing the post-synaptic neuron to produce an AP. TRUE / FALSE (g) At electrical synapses, cells are separated by a gap filled with extracellular fluid. TRUE / FALSE (h) Electrical synapses allow cell-to-cell signaling over long distances. TRUE / FALSE (i) At electrical synapses, there is a gap called the synaptic cleft between the cells, with no contact between them. TRUE / FALSE (j) At electrical synapses, the gap between the cells is bridged by ion channels. TRUE / FALSE (k) At electrical synapses, the gap between the cells is bridged by chemical agents. TRUE / FALSE (l) The ion channels bridging the gap junctions are produced by both the pre-synaptic and post-synaptic cells. TRUE / FALSE (m) Specificity of receptors means that any particular chemical agent will have only one type of receptor (e.g., a receptor that forms ion channels) to which it can bind. TRUE / FALSE (n) At chemical synapses, the effect of a neuron on another cell is determined not solely by which neurotransmitter it releases to the second cell. TRUE / FALSE (o) Affinity of a chemical agent for a receptor means the ease with which it can bind to that receptor. TRUE / FALSE (p) Hormones have long-lasting effects because they are not all lipid-soluble chemicals. TRUE / FALSE (q) Hormones can be used for signaling over long distances in the body because they are not all lipid-soluble chemicals. TRUE / FALSE (r) Receptors for neurotransmitters are not always located in the cell membrane. TRUE / FALSE (s) Receptors for local chemical mediators are not always those forming ion channels. TRUE / FALSE
Sri K.
Assertion: Impulse transmission across an electrical synapse is always faster than that across a chemical synapse. Reason: At electrical synapses, the membranes of pre- and post-synaptic neurons are in very close proximity.
Which of the following is a true difference between electrical and chemical synapses? A. electrical synapses are more complex, allowing for more subtle, graded responses in the post-synaptic neuron B. chemical synapses do not rely on or involve the movement of ions across the cell membrane C. chemical synapses are slower than electrical synapses due to the time necessary for diffusion across the synaptic cleft D. electrical synapses but not chemical synapes rely on neurotransmitter GPCRs E. chemical synapses involve the passage of neurotransmitter from the cytoplasm of the pre-synaptic neuron directly into the cytoplasm of the post-synaptic neuron
Shaiju T.
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