Part B: Nervous System II: Events at the Synapse 1. What channels in the presynaptic neuron open up in response to an action potential? 2. The presence of what ion inside the cell causes the synaptic vesicles to fuse with the membrane? 3. a. What is the name for the chemicals stored in the synaptic vesicles? b. What is the name of the space between the presynaptic neuron and the postsynaptic neuron? c. Where are the receptors located? 4. What type of channels are opened by the neurotransmitters? 5. Name two pathways for the neurotransmitters once they dissociate from the receptor. 1. 2.
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The presynaptic neuron opens up voltage-gated ion channels. Show more…
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PRE-LAB Activity 3: Investigating the Chemical Synapse 1. Match each of the following descriptions with the correct term: a. located on presynaptic membrane b. space between two neurons c. contains neurotransmitters d. located on postsynaptic membrane e. bulbous ending of axon f. chemical messenger 1. synaptic cleft 2. neurotransmitter 3. synaptic vesicle 4. receptor 5. axon terminal 6. calcium channel 2. Which neurotransmitter is released at the neuromuscular junction? 3. Put the following events that occur at the neuromuscular junction in their correct order by assigning each a number from 1 (first) to 5 (last): a. Sodium enters the muscle fiber, creating an end-plate potential. b. Neurotransmitter is released into the synaptic cleft. c. An action potential reaches the presynaptic membrane. d. Neurotransmitter binds to a receptor on the postsynaptic membrane. e. Sodium channels on the motor end plate open.
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A nerve cell is long and skinny; at the start of the nerve, there are many branches that connect the nerve to other nerve cells. These branches are called____? A) axon B) axon terminal C) dendrites D) myelin sheath A nerve cell fires (or is activated) causing the nerve cell to send a _______ down the length of the nerve and by releasing _____ into the space at the end of the nerve. A) dendrites, axons B) electrical signal, dendrites C) electrical signal, neurotransmitters D) neurotransmitters, electrical signal
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