Polio is an uncommon disease in most developed countries, but prior to widespread use of the polio vaccine, it was very common. Polio is caused by a virus that infects somatic motor neurons and destroys them. From this information, would you expect a polio victim to lose sensation, motor control, other organ function, and/or cognitive function? Explain. While most victims of polio survive, some
do not. What is the most likely cause of death?
What will be an ideal response?
If only motor neurons are affected, the primary result should be paralysis or inability to control skeletal muscles. Because respiration involves skeletal muscles, some victims die of suffocation.
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Using Figure 19.2, match the following:
1) Efferent vessels.
2) Cortex.
3) Medullary cord.
4) Trabecula.
Animal refuges provide areas for hunting and fishing
Indicate whether the statement is true or false
Which of the following statements concerning myelination is true?
A. Unmyelinated axons rest in invaginations of Schwann cells or oligodendrocytes. B. The myelin sheath inhibits the flow of electrical charges at nodes. C. Myelination will not influence the speed of conduction of action potentials. D. The myelin sheath does not electrically insulate the axons from one another. E. The myelin sheath is a protein wrapping.
In the knee joint, the medial meniscus is:
A) elastic cartilage. B) fibrocartilage. C) hyaline cartilage. D) dense regular collagenous connective tissue.