Hi please help The myelin covering on neuronsSelect one:a. Performs a function that scientists do not yet understandO b. Prevents energy loss from the brain's electrical signals and speedsthem along the neural pathwayO c. Encourages energy loss from the brain's electrical signals so thatthe brain does not get friedO d. Checks whether the brain is sending the correct electrical signalsalong the neural pathwayFin

Neurons are the smallest punctual unit of the nervous system. When the neurons are covered by myelin…

erforms a function that scientists do not yet understand O b. Prevents energy loss from the brain's electrical signals and them along the neural pathway D c. Encourages energy loss from the brain's electrical signals sc the brain does not get fried O d. Checks whether the brain is sending the correct electrical sig along the neural pathway

erforms a function that scientists do not yet understand O b. Prevents energy loss from the brain's electrical signals and them along the neural pathway D c. Encourages energy loss from the brain's electrical signals sc the brain does not get fried O d. Checks whether the brain is sending the correct electrical sig along the neural pathway

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter40: Nervous Systems

Section: Chapter Questions

Problem 8TYK

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Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodies
A change in the voltage across a neuron’s plasma membranethat makes the neuron less likely to fire an action potential isa. a change that makes the resting potential less negative.b. an excitatory postsynaptic potential.c. an inhibitory postsynaptic potential.d. a change that lowers the threshold.
Multiple sclerosis is a disease in which the immune system attacks and destroys the myelin sheath surrounding nerve cells. What effect would you expect the loss of myelin to have onthe speed of nerve impulses?
The integrative functions of the nervous system are performed mainly bya. afferent neurons.b. efferent neurons.c. neuroglia.d. sensory neurons.e. interneurons.
Regeneration of a severed axon has a better chance forsuccess in the PNS than in the CNS. Why is regeneration inthe CNS less likely to succeed?
Imagine that you are hiking in the mountains one afternoon with friends. As you turn acorner, you come across a lion standing in the middle of the trail.a. Identify the specific division of the nervous system that is responsible for thebody’s response to this situation.b. Describe at least six physiological responses you might have upon seeing thebears.c. Indicate the division of the nervous system that is responsible for returning thebody back to equilibrium after the event is over.
Ordinarily, a neuron’s trigger zone is activated before any other part ofan axon, so a wave of action potentials occurs as sodium channelsopen in the direction of the synaptic terminal. What would happen ifyou artificially stimulated an axon to reach threshold potential midwayalong its length rather than at the trigger zone?a. Action potentials would occur in the direction of the synapticterminal.b. No action potentials would occur.c. Action potentials would occur in the direction of the trigger zone.d. Both a and c are correct.
Neurons typically receive information at structures called Question 1 options: A) Myelin B) Dendrites C) Neuroglia D) Axons E) Axon hillocks
Excitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.
Which of the following is true about the conduction of action potentials? a. Thicker axons are faster because there is more surface area on thicker axons. b. Myelin speeds conduction because the glial cells add voltage gated Na+ channels to the neuron. c. Diffusion of Na+ ions between the Nodes of Ranvier happens faster than the wave of opening and closing membrane proteins can travel. d. Neurons that don’t have myelin sheaths undergo saltatory conduction e. Action potentials move slowly.
Contrast the somatic nervous system with the ANS foreach of the following:a. number of neurons between the CNS and the effectororganb. location of neuron cell bodiesc. structures each innervatesd. inhibitory or excitatory effectse. conscious or unconscious controlf. neurotransmitter(s) used
DRAW IT The reflex that pulls your hand away when you prickyour finger on a sharp object relies on a neuronal circuit withtwo synapses in the spinal cord. (a) Using a circle to represent across section of the spinal cord, draw the circuit. Label the typesof neurons, the direction of information flow in each, and thelocations of synapses. (b) Draw a simple diagram of the brainindicating where pain would eventually be perceived.