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Questions and Answers
What role do Schwann cells play in the context of neurons?
What role do Schwann cells play in the context of neurons?
- They insulate the axons to improve electrical impulse speed.
- They protect the cell body and maintain its function.
- They transmit messages between the dendrites.
- They surround neurons and support their development and regeneration. (correct)
Which of the following structures is responsible for receiving messages from other neurons?
Which of the following structures is responsible for receiving messages from other neurons?
- Dendrites (correct)
- Axon
- Myelin
- Node of Ranvier
What is the main function of the myelin sheath in neurons?
What is the main function of the myelin sheath in neurons?
- Insulating the axon for faster impulse conduction. (correct)
- Transmitting electrical impulses to the cell body.
- Facilitating communication between Schwann cells.
- Providing structural support to the neuron.
What is the significance of the Node of Ranvier in a myelinated axon?
What is the significance of the Node of Ranvier in a myelinated axon?
What component of the neuron is primarily responsible for carrying electrical impulses away from the cell body?
What component of the neuron is primarily responsible for carrying electrical impulses away from the cell body?
Flashcards
Dendrites
Dendrites
Branch-like structures that receive messages from other neurons and transmit them to the cell body.
Cell Body (soma)
Cell Body (soma)
The neuron's central part containing the nucleus and other essential components.
Axon
Axon
A tube-like structure that transmits electrical impulses from the cell body to axon terminals.
Myelin Sheath
Myelin Sheath
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Nodes of Ranvier
Nodes of Ranvier
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Study Notes
Neuron Structure and Function
- Neurons are the fundamental units of the nervous system.
- Multipolar neurons are a common type with multiple dendrites and a single axon.
- Dendrites: Branch-like structures receiving signals from other neurons. They transmit these signals to the cell body.
- Soma (Cell Body): Contains the nucleus (with DNA) and other cytoplasmic components.
- Axon: A tube-like structure carrying electrical impulses from the cell body to axon terminals.
- Axon Terminals: Pass the impulse to another neuron.
- Myelin Sheath: Insulating layer around the axon composed of protein and fatty substances. It speeds up electrical signal transmission along the axon.
- Nodes of Ranvier: Microscopic gaps in the myelin sheath that enhance signal speed.
- Schwann Cells: Cells surrounding neurons to support and aid in the development, maintenance, function, and regeneration of peripheral nerves. They create the myelin sheath.
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