Your young child has a middle ear infection: otitis media. There is a build-up of fluid, bacteria, and white blood cells, or pus, inside of the middle ear chamber. Why has this affected the child's hearing?
A) The cochlear receptor cells cannot move.
B) The bacterial infection has destroyed the otoliths.
C) The round window cannot vibrate to dissipate pressure.
D) The auditory ossicles cannot vibrate freely.
E) The tympanum is destroyed.
D) The auditory ossicles cannot vibrate freely.
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________ is a blood disorder caused by the lack of vitamin B-12.
A. Polycythemia B. Sickle-cell disease C. Hemolytic anemia D. Pernicious anemia
The osmotic pressure exerted by a cell would decrease if the cell synthesized more proteins.
Answer the following statement true (T) or false (F)
A motor unit contains
A. multiple motor neurons and one muscle fiber. B. one motor neuron and multiple muscle fibers. C. one motor neuron and one muscle fiber. D. multiple motor neurons and multiple muscle fibers.
This cross section of skin shows general cutaneous receptors. What kind of receptor does number 5 indicate?
A. Free nerve ending B. Root hair plexus C. Lamellated corpuscle D. Krause bulb E. Tactile disc