Biology, 29.11.2019 05:31, barnettboy76
Myelination occurs quickly in humans during infancy, leading, e. g., to a child's fast motor development (crawling, walking -- those toddlers can move! ) as the speed of voltage pulses through their neurons increases with myelination of those nerve fibers. however, there are a number of neurodegenerative diseases, such as multiple sclerosis and
guillain- barre syndrome (which they mention when you get your flu shot), in which demyelination (loss of the myelin sheath insulating the nerves) occurs. the effective reduction of the membrane then leads to degradation or complete loss of nerve signals. if the capacitance of a membrane increases because of an effectively thinner membrane (degradation of the myelin sheath), but the resistances of the axon and its membrane do no change appreciably due to other effects, how would degradation of myelin affect the speed of a pulse?
a. the speed of a pulse would decrease.
b. the speed of a pulse would increase.
c. the speed of a pulse would remain the same.
Answers: 3
Biology, 21.06.2019 22:00, guccikathyyy6195
Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more
Answers: 1
Biology, 22.06.2019 03:30, 001234567891011
Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent
Answers: 1
Biology, 22.06.2019 06:20, justinamber89
Cells are adapted to preform specific functions. which of the following terms refers to this capability?
Answers: 2
Myelination occurs quickly in humans during infancy, leading, e. g., to a child's fast motor develop...
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