Multiple Choice
Which structures connect neurons, and which chemicals are primarily responsible for communication between neurons at these connections?
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45. Nervous System
Neurons and Action Potentials
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In which part of a neuron is the postsynaptic membrane usually found?
A
Dendrite
B
Axon hillock
C
Node of Ranvier
D
Myelin sheath
Verified step by step guidance1
Understand the structure of a neuron: A neuron consists of several parts, including the dendrites, axon, axon hillock, nodes of Ranvier, and myelin sheath. Each part has a specific function in transmitting signals.
Learn the concept of synapses: Synapses are the junctions where neurons communicate with each other or with other cells. They consist of a presynaptic membrane (on the transmitting neuron), a synaptic cleft, and a postsynaptic membrane (on the receiving neuron).
Identify the location of the postsynaptic membrane: The postsynaptic membrane is the part of the neuron that receives signals from the presynaptic neuron. It contains receptors that bind neurotransmitters released into the synaptic cleft.
Determine which part of the neuron typically receives signals: Dendrites are the structures that extend from the cell body of a neuron and are specialized to receive signals from other neurons. The postsynaptic membrane is usually located on the dendrites.
Eliminate incorrect options: The axon hillock is involved in initiating action potentials, the nodes of Ranvier are gaps in the myelin sheath that facilitate signal conduction, and the myelin sheath insulates the axon to speed up signal transmission. None of these structures serve as the postsynaptic membrane.
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