Children born without a thymus must be kept in a germ-free environment if they are to survive. Explain why this is necessary
What will be an ideal response
If the thymus fails to develop, the T cells will not mature and become immunocompetent. If T cell function is disrupted, there is no resistance to disease.
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What is the function of the vertebral foramen?
A. To allow spinal nerves to exit the vertebrae B. To support the weight of the body C. Attachment points for tendons and ligaments D. An opening that allows the spinal cord to pass through the vertebrae
A lesion in the cerebral peduncles might affect
A. hearing. B. movement. C. sight. D. heart rate. E. taste.
Select the statement that is most correct.
A) Ganglia are collections of neuron cell bodies in the spinal cord that are associated with efferent fibers. B) Ganglia associated with afferent nerve fibers contain cell bodies of sensory neurons. C) The dorsal root ganglion is a motor-only structure. D) The cell bodies of afferent ganglia are located in the spinal cord.
Approximately how many alveoli do the lungs contain?
a. 50 million b. 500 million c. 5 billion d. 50 billion e. 500 billion