Which of the following is the appropriate threshold value for mammalian neurons?
+35 mV
-55 mV
0 mV
-80 mV
Correct Answer : B
A neuron is a messenger cell that receives and transmits information the central nervous system and peripheral nervous system. The neurons are the ones that conduct electrical signals, and there is a level that causes depolarization to reach a given value to cause an action potential.
This level is called threshold of excitation and in mammalian neurons it occurs when the threshold is around -55 mV to -65 mV.
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Correct Answer is B
Explanation
A neuron is a messenger cell that receives and transmits information the central nervous system and peripheral nervous system. The neurons are the ones that conduct electrical signals, and there is a level that causes depolarization to reach a given value to cause an action potential.
This level is called threshold of excitation and in mammalian neurons it occurs when the threshold is around -55 mV to -65 mV.
Correct Answer is C
Explanation
The CNS is contained within the dorsal body cavity, with the brain housed in thecranial cavityand the spinal cord in the spinal canal.
In vertebrates, the brain is protected by the skull, while the spinal cord is protected by the vertebrae. The brain and spinal cord are both enclosed in the meninges.
Correct Answer is B
Explanation
The nervous systems is divided into two main parts:
- The central nervous system, which comprises of the brain and spinal cord
- The peripheral nervous system, which includes nerves that branch from the spinal cord extending to all other parts of the body
Correct Answer is B
No explanation
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