Q: What is action and resting potential and how does it work in conducting electrical impulses?
A: Neurons are the functional units of the nervous system that transmit stimuli. The structure of a…
Q: What are Refractory Periods?
A: BASIC INFORMATION NEURON It is the longest cell inside the human body It is found in the brain…
Q: What is the role of the relative refractory period?
A: Introduction Nerves play vital role in conduction of signals from CNS to various other organs, nerve…
Q: How does myelination differ between the CNS and the PNS?
A: Nervous system involves a series of networks of sensory receptors that provides information about…
Q: Why are impulses transmitted more quickly down a myelinated axon than down an unmyelinated axon?
A: A neuron with myelin sheath can conduct impulse faster than the neurons which are without the myelin…
Q: Unmyelinated axons conduct action potentials without decrement, but when myelinated axons lose…
A: The nervous system is one of the vital systems of a body. It is a system of nerves which carry…
Q: What is myelin? How does myelination differ in the CNS and PNS
A: The sensory system is the piece of a creature's body that organizes its conduct and communicates…
Q: Where does saltatory conduction occur? Select one: a. From node to node in unmyelinated fibers b.…
A: saltatory conduction in normal term means propagation/movement of action potential from one node of…
Q: What is the function of themyelin sheath? Do all axonspresent a myelin sheath?
A: The insulating covering around the nerve cell is termed as the myelin sheath. The myelin sheath is…
Q: Why do Schwann cells insulate nerves?
A: Answer : researches have proven that Schwann cells in the peripheral frightened device ordinarily…
Q: Describe the myelin sheath that is formed around certain nerve fibers?
A: Neurons or nerve cells are the fundamental units of the nervous system. The function of these cells…
Q: Why is Myelin made up of Lipids and protein macromolecules?
A: Myelin is a sheath-like substance that surrounds nerve fibres, insulating & protecting them.…
Q: What is the conduction velocity of the action potentil in a myelinated axon of the nerve cell?
A: The conduction velocity is the speed in which electrochemical impulse propagates down a neural…
Q: what is relative refractory?
A: The refractory period refers to the specific time interval when the excitable cells (like neurons)…
Q: How do Schwann cells and oligodendrocytes differ with respect to the number of axons they myelinate?
A: There are two types of myelinating cells present in our nervous system: Schwann cells also known as…
Q: What is absolute refractory period?
A:
Q: What is the difference of depolarization and hyperpolarization? Why do cold receptors depolarize…
A: both are the phases in the generation and conduction of an action potential.
Q: Suppose researchers find that axon A can produce up to 1,000 action potentials per second (at least…
A: The nervous system of an organism is quite complex network that is responsible for coordinating…
Q: What is relative refractory period?
A: Refractory period – duration of time during which the cell is unable to respond to a stimulus. It…
Q: Since all APs generated by a given nerve fiber have the same magnitude, how does the CNS “know”…
A: The generation of an action potential is an " all or none phenomenon". An action potential will only…
Q: When do EPSPs and IPSPs occur?
A: EPSP :- Cause Membrane Potential to move closer to threshold. Caused by an opening of Cation…
Q: What is the functional advantage of myelination?
A: The neuron or nerve cell is the fundamental unit of the nervous system. This is divided into three…
Q: What is the function of myelin sheaths? Where are they found?
A: The nervous system is the network of neurons and nerve fibers that functions to transmit nerve…
Q: How does the resting membrane potential of a neuron develop?
A:
Q: What are some diseasescharacterized by progressiveloss of the axonal myelinsheath?
A: An abnormal condition which affects the structure or function of a part or whole body organism…
Q: Gray matter consists of... cell bodies, dendrites, and unmyelinated axons myelinated axons…
A: The central nervous system is composed of the brain and spinal cord, and the peripheral nervous…
Q: Are axons more likely to regrow in the peripheral nervous system or the central nervous system? Why?
A: CNS stands for Central nervous system. Here, the axons do not have the ability to spontaneously…
Q: What is the exact location of reticular fibres?
A: Reticular cell (fibroblast) synthesizes collagen alpha-1(III) which are used for the production of…
Q: Explain the physiological basis of the absolute and relative refractory periods?
A: The absolute refractory period can be defined as the period during which another action potential…
Q: How are Depolarization and graded potential caused?
A: Depolarization is also known as Hypopolarization. Depolarization results in a change in the electric…
Q: Why can a greater-than-normal stimulus trigger an AP during the relative refractory period but not…
A: Our brain sends and receives information in the form of electrical signals. These electrical signals…
Q: How do oligodendrocytes myelinate axons and how does this differ from myelination by Schwann cells
A: Myelination Myelin is a lipid-rich protective insulating layer present around the nerve cell axons.…
Q: Why are chemically- sensitive gated channels associated with receptors at the synapse and…
A: The potential gradient that helps the movement of the ions is known as Membrane Potential. Membrane…
Q: Once an EPSP is produced in a dendrite, how does it stimulate the production of an action potential…
A: An excitatory postsynaptic potential in short ESEP is a modification in the post-synaptic cell’s…
Q: Explain the cocept of Myelin Sheath ?
A: All organisms are made of billion s of cells. All cells are like the bricks that organise to make up…
Q: When does development of neuronal myelination occur?
A: Developmental biology is the branch of biology which studies how several interrelated mechanisms…
Q: How do you know when an action potential will fire or not on a neuron?
A: Action potential is generated when a neuron is fired. It means neural membrane allows influx of…
Q: What is the difference in appearance and function between dendrites and axons??
A: Neurons are specialized cells that transmit and receive electrical signals in the body. Each neuron…
Q: What are mirror neurons? And how do they function?
A: The neuron is the basic functional unit of the brain, is a specially designed cell to transmit…
Q: What is Afferent neurons?
A: Neurons are the cells that are the basic units that constitute the brain and the nervous system.…
Q: Which of the neuroglial cell types shown form myelin sheaths within the CNS? OA Ов Ос F
A: Neuroglial cells Neuroglia or glia or glial cells are non-neuronal cells present in brain and spinal…
Q: spinal cord would you find myelinated axons?
A: The spinal cord along with the brain is part of the central nervous system. It has myelinated axons…
Q: What does a nerve impluse flow more rapidly in myelinated nerve fibres than in non-myelinated nerve…
A: The axons of many neurons have a segmented white insulating cover over it. This is called myelin…
Q: How does myelin aid propagation of an action potential along an axon? How do the nodes of Ranvier…
A: Action potential refers to a change in the membrane potential of the nerve cells by opening and…
Q: what letter represents dorsal white column b) what letter represents structure that carrys motor…
A: In the given transverse section of the spinal cord A : dorsal root ganglion B : dorsal root…
Q: Compare and contrast the neuroglial cells that form the myelin sheaths in both the CNS and the PNS?
A: Neuroglia or glial cells are the non-neuronal cells present in both the central nervous system (CNS)…
Q: epsp’s and ipsp’s, where are they occurring
A: A transient depolarization of the postsynaptic membrane generated by the passage of positively…
How does conduction along a myelinated fiber differ from conduction along an un-myelinated fiber?
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- (a) What is myelin? (b) How does the myelination process differ in the CNS and PNS?What is the functional advantage of myelination?Identify and label the following structures on the neuron model figure below: cell body, dendrites, neuron nucleus, neurolemma, axon hillock, nucleus of Schwann cell, Nissl bodies, myelin sheath, axon, node of Ranvier, axon terminals (of neurons synapsing with model neuron), endoneurium (refer to Figure 10.6). 3) 11
- Describe how following a threshold stimulus, a action potential is carried along an unmyelinated axon? How does this differ from an action potential passing through a mylenated axon?Which of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.What is a myelin sheath? What is its function/s?
- What is the difference between the absolute refractory period versus the relative refractory period?Myelination increases the velocity of action potential propagation along an axon. What is myelination?During the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold