Would you expect a mouse or a buffalo to have more myelination on the axons of its motor neurons ? Explain why?

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cosmontumLv1

22 Sep 2023

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27 May 2019

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Giant squid is known for its long and thick axons to mediate quick reflex behaviors. Vertebrates have developed some other features in their nervous systems. One is the abundance of interneurons that provide extensive interactions between sensory and motor neurons. The other one is the use of myelin to insulate neurons. Based on what we have learned about axon conductivity and synaptic transmission, explain why these two evolutionary adaptations might be advantageous.

Please write a sentence or twohypothesis for the first question, then describe your reasoning inparagraph form for each question. Points will be rewarded accordingto best use of key vocabulary words and proper description.thanks!

1)Write a one-sentencehypothesis before you write an answer.

Many aquatic invertebrates suchas squid, lobster, and crayfish are capable of very rapid muscleactivity and body movement. They respond to stimuli such as touchjust as rapidly as do terrestrial vertebrates. These capabilitiesof some, but certainly not all, aquatic invertebrate animals occureven though the animals lack myelination of their nerveaxons. Terrestrial animals have myelin covering many of theiraxons.Explain how these fast-moving invertebrates can have rapidresponses to stimuli and rapid onset of muscle movement in thecomplete absence of myelination of their axons. Include adiscussion of the structure of their axons that allows such rapidactivity and explain how it works.

2)Do Not Write aHypothesis.

How do aquaticand marine invertebrates that employ external fertilization avoidtwo major problems %u2013 fertilization of one egg by more than onesperm and fertilization of an egg by a sperm from a closely relatedbut different species.