Which of the following occurs during repolarization?
A) Voltage-gated potassium channels open, potassium flows into the cell and some voltage-gated sodium channels inactivate.
B) Voltage-gated potassium channels open.
C) Potassium flows into the cell.
D) Some voltage-gated sodium channels inactivate.
E) Voltage-gated potassium channels open and potassium flows into the cell.
Answer: A) Voltage-gated potassium channels open, potassium flows into the cell and some voltage-gated sodium channels inactivate.
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If gametes were diploid like somatic cells, how many chromosomes would the zygote contain?
A) Twice the diploid number, and with every succeeding generation, the chromosome number would continue to double and normal development could not occur. B) Half the diploid number with no change in development. C) Triple the diploid number, and with every succeeding generation, the chromosome number would continue to triple and normal development would not occur. D) There is no relationship between gametes and somatic cells.
Which of the following is involved in the myelination of axons of the central nervous system?
A) microglia B) astrocytes C) oligodendrocytes D) Schwann cells
The hypothalamus
A. is located superior to the thalamus. B. is located inferior to the pituitary gland. C. rests in the sella turcica. D. is also called the neurohypophysis. E. regulates the secretory activity of the anterior lobe of the pituitary gland.