1) Distinguishing the pitch of sounds is possible because: A) different frequenc
ID: 221548 • Letter: 1
Question
1) Distinguishing the pitch of sounds is possible because:
A) different frequencies of sounds stimulate different regions of the basilar membrane in the cochlear duct.
B) different frequencies of sounds cause different frequencies of action potentials in neurons in the auditory nerve. C) different frequencies of sounds make the eardrum vibrate with different amplitudes.
D) different frequencies of sounds cause different kinds of action potentials in neurons in the auditory nerve.
E) there are many different types of receptors for sound, each of which responds to a single frequency.
2)Which of the following statements regarding the vestibular system is TRUE?
A) Deflection of the basilar membrane by fluid moving within the semicircular canals allows us to detect rotational movement of the head.
B) The vestibular apparatus is principally involved in our ability to detect and interpret sound.
C) Receptors in the utricle and saccule detect changes in the position of the head with respect to gravity.
D) Hair cells in the cochlea are involved in the detection of movement and position of the head.
E) The utricle and saccule are mainly responsible for detecting angular rotation of the head.
3) What protein is the principal component of skeletal muscle thick filaments?
A) myosin B) tropomyosin C) troponin D) calmodulin E) actin
4) During concentric isotonic contraction of a skeletal muscle fiber, which of these occurs?
A) sarcomeres lengthen B) thin filaments shorten C) I bands shorten D) A bands shorten E) A bands lengthen
5) In skeletal muscle cells, calcium initiates contraction by binding to:
A)actin. B) troponin. C) tropomyosin. D) the thick filament. E) myosin.
These questions were pulled from a Biology/Physiology exam. PLEASE PLEASE PLEASE, Include an explanation of why the correct answer is a specefic one, I really appreciate that.
thanks
Explanation / Answer
1. Distinguishing the pitch of sounds is possible because
different frequencies of sounds stimulate different regions of the basilar membrane in the cochlear duct.
2.
Deflection of the basilar membrane by fluid moving within the semicircular canals allows us to detect rotational movement of the head.
3.
4.
5.
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