1- In regards to fitness, what are the advantages of internal gills over external gills?
2- How does the inverse proportional relationship between pressure and volume bring about inhalation & exhalation in a mammalian breathing system?
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1- ???
2- I think it has something to do with alveoli and the surface area of the lungs...
My book doesn't cover these topics thoroughly, and I can't find anything online as of yet. Please help me! I would really appreciate it. Thank you!
2007-04-04 15:38:30 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
1. Internal gills are protected inside the body. The organism has some type of adaptation to send water over the gills, so water exposure is still good.
2. When the diaphram contracts, the "dome" shape of the diaphram pulls down flatter. This change increases the volume of the chest cavity, decreasing the pressure. With lower pressure inside the chest cavity, air is pulled into the lungs.
The inverse proportion means that one measurement increases while the other measurement decreases. Less pressure ... more volume.
2007-04-04 16:23:09 · answer #1 · answered by ecolink 7 · 0⤊ 0⤋
for 2, when the diaphragm expands, it increases the volume of the lungs which in turn creates negative pressure which draws in air. When the diaphragm contracts, it decreases the volume in the lungs forcing the air to be expelled.
2007-04-04 23:03:38 · answer #2 · answered by Anonymous · 0⤊ 0⤋