Podcast
Questions and Answers
Which of the following is NOT a component of nervous tissue?
Which of the following is NOT a component of nervous tissue?
- Neuroglial cells
- Neurons
- Extracellular matrix
- Muscle cells (correct)
What is the main function of neurons?
What is the main function of neurons?
- To respond to environmental changes
- To alter the ionic gradient across their plasma membranes
- To produce action potentials
- To transmit nerve impulses (correct)
What are the three main parts of a neuron?
What are the three main parts of a neuron?
- Cell body, dendrites, and axons (correct)
- Nucleus, cytoplasm, and cell membrane
- Synapses, neurotransmitters, and receptors
- Myelin sheath, Schwann cells, and nodes of Ranvier
Which organelle is located only in the cell body of a neuron?
Which organelle is located only in the cell body of a neuron?
Which type of neuron has one dendrite and one axon?
Which type of neuron has one dendrite and one axon?
What is the function of dendritic spines in the central nervous system (CNS)?
What is the function of dendritic spines in the central nervous system (CNS)?
What is the role of glial cells in the central nervous system (CNS)?
What is the role of glial cells in the central nervous system (CNS)?
Which glial cells are the predominant cells in the white matter of the CNS?
Which glial cells are the predominant cells in the white matter of the CNS?
Which glial cells have long radiating, branching processes and can be classified into two types, fibrous and protoplasmic?
Which glial cells have long radiating, branching processes and can be classified into two types, fibrous and protoplasmic?
Which glial cells extend processes that associate with or cover synapses, affecting the formation, function, and plasticity of these structures?
Which glial cells extend processes that associate with or cover synapses, affecting the formation, function, and plasticity of these structures?
Which glial cells form myelin sheaths in the peripheral nervous system (PNS)?
Which glial cells form myelin sheaths in the peripheral nervous system (PNS)?
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Study Notes
Nervous Tissue Components
- Nervous tissue consists of various components, but one thing it does not have is __________ (answer not provided).
Neurons
- The main function of neurons is to transmit and process information.
- A neuron consists of three main parts: dendrites, cell body, and axon.
- The cell body of a neuron contains the organelle called Nissl bodies (or chromatophilic substance).
Unipolar Neurons
- Unipolar neurons have one dendrite and one axon.
Dendritic Spines
- Dendritic spines in the central nervous system (CNS) function to increase the surface area for synaptic transmission.
Glial Cells
- Glial cells in the central nervous system (CNS) provide support, protection, and maintenance functions for neurons.
- Oligodendrocytes are the predominant cells in the white matter of the CNS.
- Astrocytes have long radiating, branching processes and can be classified into two types, fibrous and protoplasmic.
- Astrocytes also extend processes that associate with or cover synapses, affecting the formation, function, and plasticity of these structures.
Myelin Sheath Formation
- In the peripheral nervous system (PNS), Schwann cells form myelin sheaths.
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