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Questions and Answers
What is the primary function of an axon?
What is the primary function of an axon?
- To transmit impulses toward the cyton
- To transmit impulses away from the cyton (correct)
- To store neurotransmitters
- To receive incoming signals from other neurons
Which of the following neurotransmitters is not mentioned in the context?
Which of the following neurotransmitters is not mentioned in the context?
- Dopamine
- GABA (correct)
- Acetylcholine
- Serotonin
Which type of neuron is characterized by transmitting impulses from sense organs?
Which type of neuron is characterized by transmitting impulses from sense organs?
- Multipolar neurons
- Association neurons
- Motor neurons
- Sensory neurons (correct)
What is the process called when sodium ions rush inward into a neuron?
What is the process called when sodium ions rush inward into a neuron?
What classifies a neuron as a 'di' neuron?
What classifies a neuron as a 'di' neuron?
Flashcards
Axon Function
Axon Function
Transmits impulses away from the cell body (cyton).
Neurotransmitters
Neurotransmitters
Chemical messengers that neurons use to communicate with each other.
Impulse
Impulse
A wave of energy traveling along a neuron, triggered by a disturbance.
Depolarization
Depolarization
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Sensory Neuron
Sensory Neuron
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Study Notes
Axon Function
- Axons transmit impulses away from the cell body (cyton)
- When an impulse reaches the axon terminals, neurotransmitters are released
- Neurotransmitters communicate with other neurons
- A brain decision can involve many neurons; the proper neurotransmitter's arrival triggers a specific response in a neuron
Neuron Types
- Anatomical Classification: Based on the number of extensions from the cell body (cyton)
- Mono- 1 extension
- Di- 2 extension
- Poly- Multiple extensions
- Functional Classification: Based on their function
- Sensory: Transmit impulses from sensory organs via long dendrites
- Motor: Transmit signals to muscles or glands. Often use many long axons (multi or poly) and connections (intermunicipal).
- Association/Interneurons: Interpret and make decisions (often multi/poly, no sending projections).
Impulses
- An impulse is a wave of energy that travels through a neuron when it's stimulated.
- The neuron's membrane is positively charged outside and negatively inside.
- During stimulation, sodium ions rush inward, creating a depolarization event.
- The depolarization wave continues as a signal along the neuron, this wave constitutes the impulse.
- Over 20 different neurotransmitters involved in signal transmission (e.g. Epinephrine, Norepinephrine, Acetylcholine, Dopamine, Serotonin)
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