Chat with AIExam 3: Neurophysiology: the Structure and Functions of the Cells of the Nervous System
Which of the following is not a function that can be influenced by metabotropic receptors?
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VerifiedB
Describe the structure and function of the microfilaments.
(40) VerifiedThe microfilaments are the smallest in diameter of the three types of cytoskeleton fiber,and may be involved with the structural changes that occur during learning.
-Identify the events that are occurring at the points labeled 1,2,3,and 4 in this figure,and describe their significance to the occurrence of an action potential.
-Identify the events that are occurring at the points labeled 1,2,3,and 4 in this figure,and describe their significance to the occurrence of an action potential. (37) 
Answered by Examlex AI CopilotAt point 1, the cell is at resting membrane potential, which is typically around -70mV. This is the state of the cell when it is not transmitting any signals.
At point 2, a stimulus causes the cell membrane to depolarize, meaning the inside of the cell becomes more positive. This is the beginning of an action potential.
At point 3, the cell reaches its threshold potential, typically around -55mV. This is the point at which the action potential is inevitable and will occur.
At point 4, the cell membrane repolarizes, returning to its resting membrane potential. This is the phase where the cell is preparing for the next action potential.
The significance of these events to the occurrence of an action potential is that they represent the different phases of the action potential process. The depolarization at point 2 triggers the action potential, the reaching of the threshold potential at point 3 ensures that the action potential will occur, and the repolarization at point 4 allows the cell to reset and be ready for the next action potential. These events are crucial for the transmission of signals in the nervous system.
The initial cone-shaped segment of an axon at the junction with the cell body is known as the axon
(30) Oligodendrocytes form the myelin sheaths in the central nervous system.
(31) The hyperpolarization observed following an action potential is the result of
(28) What does it really mean when we say that a neuron has a resting potential of -70 mV?
(29) Protein structures located on the presynaptic neuron that monitor its activity level are called
(38) Mitochondria are responsible for the production of proteins in the neural cell body.
(32) Which type of glia may actually participate in neural communication?
(29) Chemical messengers in the axon terminal called neurotransmitters are contained within
(24) Action potentials only go in one direction,away from the cell body,because
(36) Following injury,which of the glia may actually inhibit neural regrowth by forming scar tissue?
(31) Knobs located on the dendrites that provide additional locations for synapses are known as dendritic
(32) Electrical synapses provide the ability to send only excitatory messages.What advantages are gained by having the ability to send both excitatory and inhibitory messages?
(29) The glia that participate in the formation of the blood-brain barrier are the
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