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Questions and Answers
What is the main characteristic of excitable tissues?
Which structure is responsible for conducting impulses away from the cell body in a neuron?
What is the function of dendrites in a neuron?
Which characteristic is associated with the excitability of nerve fibers?
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What does membrane potential refer to?
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What is the main characteristic of excitable tissues?
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What is the function of an axon in a neuron?
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Which type of nerve fiber is characterized by the presence of myelin sheath?
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What does excitability refer to in the context of nerve fibers?
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What is the electrical potential that exists between the outer and inner surface of the cell membrane of all cells in the body called?
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What is the main characteristic of excitable tissues?
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What is the function of dendrites in a neuron?
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Which type of nerve fiber is characterized by the presence of myelin sheath?
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What does excitability refer to in the context of nerve fibers?
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What is the electrical potential that exists between the outer and inner surface of the cell membrane of all cells in the body called?
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Study Notes
- Excitable tissues are characterized by a large resting membrane potential and the ability to respond to stimuli with a series of changes in membrane potential called Action Potentials.
- Excitable tissues include nerves and all types of muscle (smooth, skeletal, and cardiac).
- The neuron is the basic structural unit of the nervous system, consisting of a cell body, cytoplasm, nucleus, and cell organelles, as well as cell processes called axon and dendrites.
- The axon of a neuron conducts impulses away from the cell body, while dendrites increase the surface area of the cell and transmit impulses to the cell body.
- Neurons have 4 types: based on the presence or absence of myelin sheath, and based on function.
- Myelin sheathed nerves are faster and more efficient at conducting impulses, while unmyelinated nerves are slower and less efficient.
- Functional types of nerves include motor, sensory, and autonomic nerves, each with unique characteristics.
- Nerve fibers have several characteristics, including excitability (ability to respond to stimuli), conductivity (ability to transmit impulses), adaptation (decrease impulse discharge with constant stimulus), and non-fatigability (do not tire easily).
- Membrane potential is the electrical potential that exists between the outer and inner surface of the cell membrane of all cells in the body.
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Description
Learn about the characteristics of excitable tissues and neurons, including their resting membrane potential and response to stimulation through action potential. Explore the structure of a neuron and its components such as cell body and cell processes like axon and dendrites.
