Dr. Paula Lemons BIOL 1104 Lecture 18: Chemical Synapses, Sensory Receptors and Effectors Clicker Questions What is the figure showing? Study the figure on the previous slide and try to understand what is happening. On a separate sheet of paper, write answers to the following questions and turn them in on the table in the back on your way out of class: What is the ?nerve impulse?? What is contained within the synaptic vesicles? How does the ion channel open? CQ1. Neurotransmitters can cause ion channels on the post-synaptic cell to open. What is the result of open ion channels in the post-synaptic cell? [Understanding] The membrane potential of the post-synaptic cell will become more positive. The membrane potential of the post-synaptic cell will become more negative. The membrane potential of the post-synaptic cell will change, depending on what type of ion channel opens. An action potential will be generated in the post-synaptic cell. CQ2. Endorphins are peptide neurotransmitters that decrease the perception of pain. How do you think they work? [Application] They open ion channels on the post-synaptic cell that depolarize the post-synaptic cell. They open ion channels on the post-synaptic cell that hyperpolarize the post-synaptic cell. CQ3. Which of the following factors do NOT contribute to the ?decision? of a post-synaptic cell to generate an action potential or not. [Understanding] The strength of the action potential in the presynaptic cell. The neurotransmitters that are released from the pre-synaptic cells and the channels they bind to on the post-synaptic cell. The number of pre-synaptic cells that synapse with the post-synaptic cell. The timing of the release of neurotransmitters from the pre-synaptic cells. Fig. 50-13 G protein Sugar molecule Phospholipase C Tongue Sodium channel PIP2 Na+ IP3 (second messenger) Sweet receptor ER Nucleus Taste pore SENSORY RECEPTOR CELL Ca2+ (second messenger) IP3-gated calcium channel Sensory receptor cells Taste bud Sugar molecule Sensory neuron
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