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Questions and Answers
Which part of the nerve axon lacks the myelin sheath?
Which part of the nerve axon lacks the myelin sheath?
- Axon hillock
- Central core of cytoplasm
- Nodes of Ranvier (correct)
- Axon terminal
What is the function of the Schwann sheath?
What is the function of the Schwann sheath?
- Acts as an insulator and protects the axon
- Regenerates nerve fiber and forms myelin sheath (correct)
- Provides structural support to the nerve axon
- Aids in the transmission of electrical signals
Why are electrical stimuli preferred in practical experiments?
Why are electrical stimuli preferred in practical experiments?
- They are easy to detect without specialized equipment
- They are similar to the natural signals inside the human body (correct)
- They can induce both chemical and mechanical responses
- They cause minimal damage to living tissue
What is excitability in the context of living tissues?
What is excitability in the context of living tissues?
What are the factors that affect the degree of response to a particular stimulus?
What are the factors that affect the degree of response to a particular stimulus?
What is the function of dendrites in a neuron?
What is the function of dendrites in a neuron?
What is the role of the axon in a neuron?
What is the role of the axon in a neuron?
What is the function of Nissel bodies in a neuron?
What is the function of Nissel bodies in a neuron?
What does severe activity and anoxia cause in relation to Nissel bodies in a neuron?
What does severe activity and anoxia cause in relation to Nissel bodies in a neuron?
Why can a neuron never divide?
Why can a neuron never divide?
What makes up the structural unit of the nervous system?
What makes up the structural unit of the nervous system?
Which component of the nerve axon is responsible for regenerating nerve fibers and forming the myelin sheath?
Which component of the nerve axon is responsible for regenerating nerve fibers and forming the myelin sheath?
What property of living tissue refers to its ability to respond to a stimulus?
What property of living tissue refers to its ability to respond to a stimulus?
Which type of stimulus is preferred in practical experiments due to its similarity to the natural signals inside the human body and the ease of controlling its intensity?
Which type of stimulus is preferred in practical experiments due to its similarity to the natural signals inside the human body and the ease of controlling its intensity?
What is the minimal intensity of a current needed to stimulate excitation called?
What is the minimal intensity of a current needed to stimulate excitation called?
In the Strength-Duration curve, what is the time needed by a current of double the rheobase intensity to stimulate excitation?
In the Strength-Duration curve, what is the time needed by a current of double the rheobase intensity to stimulate excitation?
What does the Strength-Duration curve illustrate about the relationship between stimulus intensity and time needed for excitation?
What does the Strength-Duration curve illustrate about the relationship between stimulus intensity and time needed for excitation?
What is the minimal time needed for a stimulus to produce a response called?
What is the minimal time needed for a stimulus to produce a response called?
In diathermy, what effect does the use of high voltage alternating currents for a very short period of time cause?
In diathermy, what effect does the use of high voltage alternating currents for a very short period of time cause?
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