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Chapter 9: Problem 23

Neurotransmitters are synthesized in ___ and are stored in ___

Short Answer

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Neurotransmitters are synthesized in the neuron's cell body and stored in synaptic vesicles in the axon terminal.

Step by step solution

01

Understanding Neurotransmitter Synthesis

Neurotransmitters are chemical messengers responsible for transmitting signals across a synapse from one neuron to another. The synthesis of neurotransmitters generally occurs in the neuron's cell body, where the necessary enzymes and building blocks are present to create these molecules.
02

Identifying the Storage Site for Neurotransmitters

Once synthesized, neurotransmitters need to be transported to the area where they will be released. They are stored in synaptic vesicles, which are located in the axon terminal of the neuron. These vesicles hold the neurotransmitters until a signal triggers their release into the synaptic cleft.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Neuronal Communication
Neuronal communication is a fundamental process in the nervous system, allowing the transmission of information throughout the body. This communication occurs between neurons and involves several key steps. When a nerve impulse, or action potential, reaches the end of a neuron, it triggers the release of neurotransmitters. These chemical messengers are released into a small gap called the synaptic cleft.
  • Neurotransmitters bind to receptors on the neighboring neuron.
  • Binding may initiate a new action potential in the receiving neuron.
  • This process enables rapid and efficient signal transmission across the nervous system.
Each neurotransmitter can have specific effects depending upon the type of receptor it binds to. The precise nature of these interactions underlies complex brain functions, including mood regulation, sensation, and motor control.
Synaptic Vesicles
Synaptic vesicles play a crucial role in storing neurotransmitters. They are small, spherical organelles found within the neuron's axon terminal, where they wait to release their contents upon arrival of an action potential.
These vesicles ensure that neurotransmitters are protected from degradation and are readily available when needed. Upon the arrival of an action potential:
  • Synaptic vesicles fuse with the neuronal membrane.
  • They release neurotransmitters into the synaptic cleft via a process called exocytosis.
  • This release is tightly regulated by calcium ions, which enter the neuron during the action potential.
The released neurotransmitters then have the opportunity to bind to receptor sites on the adjacent neuron, continuing the chain of signal transmission.
Neuron Structure
The structure of a neuron is adapted to support its function of transmitting information. A typical neuron consists of several distinct parts:
  • The cell body, or soma, which contains the nucleus and most cellular machinery for maintaining cell function and synthesizing neurotransmitters.
  • Dendrites, which are branched structures that receive signals from other neurons and convey them towards the cell body.
  • The axon, a long, slender projection that transmits signals away from the cell body towards other neurons.
  • At the end of the axon lies the axon terminal, where synaptic vesicles store and release neurotransmitters.
This specialized structure allows neurons to efficiently collect and send information, making them key players in the nervous system's communication network.

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