Question

question 118
0.25 pts
paranasal sinuses are normally filled with:
bone marrow.
a serous fluid.
mucus.
air.
question 119
0.25 pts
the structures that deflect air as it passes through the nose are called:
choanae.
paranasal sinuses.
conchae.
vibrissae.
question 120
0.25 pts
the external openings to the nasal cavities can be referred to as:
nostrils.
anterior nares.
external nares.
all of the above.

Explanation:

Question 118

Paranasal sinuses are air - filled cavities within the bones of the skull around the nasal cavity. Bone marrow is in bones, serous fluid has other roles, and mucus is more related to nasal cavity lining. So they are filled with air.

Choanae are posterior nasal openings, paranasal sinuses are air - filled cavities, vibrissae are nasal hairs. Conchae (nasal conchae) are the structures that deflect air as it passes through the nose to warm, moisten, and filter it.

Nostrils, anterior nares, and external nares all refer to the external openings of the nasal cavities. So "all of the above" is correct.

Answer:

D. air.

Question 119