In a myelinated axon, the greatest concentration of voltage-gated ion channels is in the
A. myelinated regions.
B. neurofibril nodes.
B
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Muscles of the neck and shoulder are innervated by spinal nerves from the ________ region
A) cervical B) thoracic C) lumbar D) sacral E) coccygeal
During which phase of meiosis do the centromeres of double-stranded chromosomes divide, followed by the sister chromatids moving toward opposite poles of the cell, and now being called single-stranded chromosomes?
A. Telophase II B. Anaphase I C. Metaphase II D. Metaphase I E. Anaphase II
Around day 21 of development the primitive heart begins to beat. At this stage it contains the four chambers: two atria and two ventricles.
Answer the following statement true (T) or false (F)
If left untreated, cataracts can lead to what?
A. Blindness B. Presbyopia C. Myopia D. Hyperopia