Three-year old Trevor is admitted to the hospital with stenosis (narrowing) of the foramen magnum. This condition directly affects which of these structures?
A. Facial and vestibulocochlear nerves
B. Optic nerve
C. Spinal cord
D. Internal jugular veins
E. Carotid arteries
Answer: C
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The posterior horns of the spinal cord contain
A. axons of sensory neurons and cell bodies of interneurons. B. axons of interneurons. C. axons of motor neurons and cell bodies of interneurons. D. axons of sensory and motor neurons. E. autonomic motor neurons.
Vision impairment as a result of old age and the loss of elasticity in the lens is called ________
A) Diplopia B) Myopia C) Astigmatism D) Presbyopia
Lysosomes ________.
A) are always used for the cell to "commit suicide" B) contain acid hydrolases that are potentially dangerous to the cell C) maintain a highly alkaline internal environment D) are the major site of protein synthesis
Autoimmune diseases such as arthritis become more common as people get older. "Autoimmune" means that the immune system
A. protects itself. B. no longer produces antibodies. C. is incapable of initiating phagocytosis. D. produces T cells but no B cells. E. destroys the body's own tissues.