Please answer the following questions for numbers 38,39 and 40. If you are not s

Question

Please answer the following questions for numbers 38,39 and 40. If you are not sure please write it next to the problem number. I am a little confused on these, I will rate good!

38. Which of the following statements about electrical synapses (gap junctions) is FALSE? a. They are composed of two hemichannels known as connexons b. They usually pass signals directionally (i.e. pre to post-synapse and post to pre-synapse) c. Each hemichannel is made up of 5 connexins d. Neurotransmission is almost instantaneous e. They allow cytoplasmic continuity between pre and post-synaptic cells 39. Which of the following would not occur at an electrical synapse? a. A depolarization in the presynaptic cell produces a hyperpolarization in the postsynaptic cell b. When the presynaptic neuron produces an action potential, the postsynaptic cell depolarizes almost instantaneously c. The two neurons appear to have synchronous action potentials d. Electron microscope images show synapses that appear to be zippered together e. lons flow through the synapse 40. In an electron micrograph of a chemical synapse, which of the following statements is FALSE? a. The presynaptic terminal contains synaptic vesicles b. Peptide releasing vesicles appear electron dense c. Connexons zipper the pre and post-synaptic membranes together d. Vesicles filled with amino acids have clear centers e. The active zone is a presynaptic electron dense region associated with the membrane

Explanation / Answer

38. C

Each hemichannel is composed of 6 connexins.

39.a

A depolarisation in the pre synaptic cell would result in depolarisation in the post synaptic cell.

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