Which of the following is true about paranasal sinuses?

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Which of the following is true about paranasal sinuses?

a. paranasal sinuses lighten the skull
b. paranasal sinuses are found in maxiallary, ethmoid, and lacrimal bones
c. paranasal sinuses contain passages acting as one-way valves
d. paranasal sinuses enhance the resonance of the voice

2007-03-20 15:14:18 · 3 answers · asked by mitch 1 in Science & Mathematics ➔ Biology

3 answers

All of the above.

2007-03-20 15:22:29 · answer #1 · answered by Annie D 6 · 0⤊ 0⤋

1-a, 2-b, 3-d

2016-03-16 23:50:02 · answer #2 · answered by Anonymous · 0⤊ 0⤋

paranasal sinuses enhance the resonance of the voice and lighten the skull

2014-03-30 04:25:48 · answer #3 · answered by Karen R 1 · 0⤊ 0⤋