The myelin sheath plays an important role in neuron structure and function. However, when the myelin sheath is missing or not fully intact, there are consequences
There are many conditions that cause demyelination of neurons, some are autoimmune disorders, such as multiple schlerosis, and others are hereditary. The symptoms of these conditions vary, but often include speech impairment and difficulty coordinating movement. Which of the following correctly connects the symptoms of demyelination with the process of nerve impulse transmission? A) Demyelination prevents the formation of an action potential in sensory neurons that transmit signals from the environment to the central nervous system.
B) Demyelination slows nerve impulse transmission.
C) Demyelination prevents the uptake of neurotransmitters needed to propagate a message to the next neuron.
D) Demyelination targets the central nervous system.
B
You might also like to view...
Predict the outcome of an F+ to F- mating if the F+ cell lacked a functional tra operon.
A. Conjugation would not occur because there would be no contact between the F+ and F- cells. B. Upon entering the recipient, the F factor would be unable to integrate into to host chromosome. C. Conjugation would occur, but the F- recipient could not become Hfr. D. There would be no effect on conjugation.
Which of the following processes is least likely to be coupled to eukaryotic transcription?
A. DNA repair B. DNA replication C. RNA processing D. mRNA transport E. All of the choices given are coupled to eukaryotic transcription.
The facial features seen in the child pictured here are characteristic of what syndrome?
1.Down syndrome
2.Trisomy 13
3.fetal alcohol syndrome
4.Cri du chat
In an HIV-infected cell producing HIV virus particles, the viral glycoprotein is expressed on the plasma membrane. How do the viral glycoproteins get to the plasma membrane? They are synthesized _____
A) on ribosomes on the plasma membrane B) by ribosomes in the rough ER and arrive at the plasma membrane in the membrane of secretory vesicles C) on free cytoplasmic ribosomes and then inserted into the plasma membrane D) by ribosomes in the rough ER, secreted from the cell, and inserted into the plasma membrane from the outside