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Updated Mar 15, 2026

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2 pages

Fun with Neurons: Structure, Function, and Cool Diagrams

Erica

@erica4

Neurons and Synaptic Transmission: Structure, Function, and Communication

Neurons are... Show more

Biopsychology
Paper 2
# NEURONS AND SYNAPTIC TRANSMISSION

## The structure and function of neurons
- Neurons transmit signals electrically

Synaptic Transmission and Neurotransmitters

Synaptic transmission is the process by which signals are transmitted between neurons. While signals within neurons are transmitted electrically, the communication between neurons occurs chemically across the synapse.

The process of synaptic transmission involves several steps:

An electrical impulse reaches the presynaptic terminal.
This triggers the release of neurotransmitters from synaptic vesicles.
Neurotransmitters diffuse across the synaptic cleft.
They bind to postsynaptic receptor sites on the next neuron.
The chemical signal is converted back into an electrical impulse in the postsynaptic neuron.

Example: Neurotransmitters such as dopamine, serotonin, and acetylcholine play crucial roles in various bodily functions and mental processes.

Excitation and Inhibition in Neural Communication

Neurotransmitters can have either an excitatory or inhibitory effect on the neighboring neuron:

Excitation: Neurotransmitters like adrenaline increase the positive charge of the postsynaptic neuron, making it more likely to fire and pass on the electrical impulse.
Inhibition: Neurotransmitters such as serotonin increase the negative charge of the postsynaptic neuron, decreasing the likelihood of it firing and passing on the electrical impulse.

Highlight: The balance between excitatory and inhibitory signals determines whether a postsynaptic neuron will fire or not, a process known as summation.

Summation Process

Summation is the process that decides whether a postsynaptic neuron fires:

If the inputs are mainly inhibitory, the postsynaptic neuron is less likely to fire.
If the inputs are mainly excitatory, the postsynaptic neuron is more likely to fire.

Vocabulary: Excitatory postsynaptic potential (EPSP) increases the likelihood of a neuron firing, while inhibitory postsynaptic potential (IPSP) decreases this likelihood.

Understanding these processes is crucial for comprehending how the nervous system functions and how various psychological and physiological phenomena occur.

Types of Neurons and Their Structure

The nervous system relies on three main types of neurons and their functions to facilitate communication throughout the body. These include:

Sensory neurons: Carry messages from the Peripheral Nervous System (PNS) to the Central Nervous System (CNS)
Relay neurons: Connect sensory neurons to motor neurons or other relay neurons
Motor neurons: Link the CNS to effectors such as muscles and glands

Highlight: Neurons can vary greatly in size, ranging from less than a millimeter to up to a meter in length.

The structure of a neuron consists of several key components:

Cell body: Contains the nucleus, which houses the genetic material of the cell
Dendrites: Protrusions from the cell body that receive nerve impulses from surrounding neurons
Axon: Carries impulses away from the cell body along the length of the neuron
Myelin sheath: Covers the axon, protecting it and speeding up transmission
Terminal buttons: Located at the end of axons, they communicate with the next neuron across the synapse

Vocabulary: Nodes of Ranvier are gaps in the myelin sheath that allow for saltatory conduction, increasing the speed of neural transmission.

Electrical Transmission in Neurons

When a neuron is activated by a stimulus, the inside of the cell becomes positively charged, creating an electrical impulse. This process is known as the "firing" of a neuron and represents the electrical transmission within the neuron itself.

Definition: Electrical transmission refers to the propagation of an electrical impulse along the length of a neuron's axon.

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Updated Mar 15, 2026

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2 pages

Fun with Neurons: Structure, Function, and Cool Diagrams

Erica

@erica4

Neurons and Synaptic Transmission: Structure, Function, and Communication

Neurons are the fundamental units of the nervous system, responsible for transmitting signals both electrically and chemically. This summary explores the structure and function of neurons, types of neurons, and the... Show more

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Synaptic Transmission and Neurotransmitters

The process of synaptic transmission involves several steps:

An electrical impulse reaches the presynaptic terminal.
This triggers the release of neurotransmitters from synaptic vesicles.
Neurotransmitters diffuse across the synaptic cleft.
They bind to postsynaptic receptor sites on the next neuron.
The chemical signal is converted back into an electrical impulse in the postsynaptic neuron.

Example: Neurotransmitters such as dopamine, serotonin, and acetylcholine play crucial roles in various bodily functions and mental processes.