Pitch is determined by
A) frequency of the sound vibrations.
B) intensity of sound.
C) volume of sound.
D) duration of sound.
Correct Answer:
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Q54: The space between the axon of one
Q55: Communication between neurons is achieved by
A) hormones.
B)
Q56: Hormone messages are received by
A) neurotransmitters.
B) receptor
Q57: Acetylcholine is a
A) neurotransmitter.
B) hormone.
C) synthetic drug.
D)
Q58: The fovea centralis has the highest concentration
Q60: _ is an exocrine gland.
A) The kidney
B)
Q61: Balance is maintained by
A) the tympanum.
B) ear
Q62: Skeletal muscle contractions are under the control
Q63: Thick protein filaments in muscle contain
A) actin.
B)
Q64: Muscle contractions are partially regulated by
A) the
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