Question

question 14
1 pts
bony labyrinth structure containing the utricle and saccule.
vestibule
macula densa
macula lutea
scala vestibule
ora serrate
question 15
1 pts
which of the following statements does not correctly describe the spiral organ of corti?
the \hairs\ of the receptor cells are embedded in the tectorial membrane.
the tectorial membrane bends with vibrations, whereas the basilar membrane is rigid and fixed.
high - frequency sounds stimulate hair cells at the basal end of the basilar membrane.
the spiral organ is part of the cochlear duct, which equals the scala media.
question 16
1 pts
the hormone produced by the heart
increases the excretion of sodium in the urine.
increases calcium levels in the blood.
is secreted in response to low blood volumes.
decreases urine output.

Explanation:

• Question 14: The vestibule is a bony labyrinth structure that contains the utricle and saccule. The macula densa is part of the kidney's juxtaglomerular apparatus. The macula lutea is in the eye. The scala vestibule is part of the cochlea. The ora serrata is the junction between the retina and the ciliary body in the eye.
• Question 15: In the spiral organ of Corti, the basilar membrane vibrates (it is not rigid and fixed). The tectorial membrane is relatively rigid. The "hairs" (stereocilia) of receptor cells are embedded in the tectorial membrane. High - frequency sounds stimulate hair cells at the basal end of the basilar membrane. The spiral organ is part of the cochlear duct (scala media).
• Question 16: The hormone produced by the heart is atrial natriuretic peptide (ANP). ANP increases the excretion of sodium in the urine (natriuresis). It is secreted in response to high blood volume (not low). It increases urine output (not decreases). Hormones like parathyroid hormone increase calcium levels in the blood.

Answer:

• Question 14: vestibule
• Question 15: The tectorial membrane bends with vibrations, whereas the basilar membrane is rigid and fixed.
• Question 16: increases the excretion of sodium in the urine.