Black lung disease is caused specifically by continued exposure to .
A) toxic fumes.
B) heavy metals.
C) carcinogens.
D) inhaled particulate dust.
Answer: D) inhaled particulate dust.
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Which structure pushes on the oval window of the inner ear to stimulate the auditory receptors?
A) incus B) stapes C) malleus D) tympanic membrane
True or False? The number of erythrocytes in a milliliter sample of blood is the same as the number of leukocytes in a milliliter sample of blood.
Answer the following statement true (T) or false (F)
Nucleotides
A. have nothing to do with the genetic information in the nucleus. B. are part of DNA molecules but not RNA molecules. C. are the building blocks of nucleic acids. D. are proteins that function as enzymes. E. hold the nucleus together.
What occurs when gamma motor neurons to a muscle are activated?
A. The muscle lengthens. B. The muscle spindle goes slack. C. Action potential firing increases in afferent neurons from the muscle spindles. D. The contractile ends of intrafusal fibers elongate. E. Extrafusal muscle fibers within that muscle are inhibited from contracting.