During normal exhalation, air leaves the lungs because
A. the strong chest muscles force air out by squeezing the chest cavity.
B. there is more carbon dioxide inside the lungs than outside, so air flows outward by diffusion.
C. air currents outside the body draw air out of the lungs.
D. of the elastic recoil of muscles making air pressure greater inside the lungs than outside, so it flows outward.
Answer: D
You might also like to view...
Describe the processes that account for the drifting of continents away from one another or toward one another
What will be an ideal response?
In what way or ways does or do seedless
vascular plants differ from seed plants?
a. seedless vascular plants do not have a sporophyte stage; seed plants do b. the sporophyte of the seed plants gives rise to gametes; the sporophyte of seedless vascular plants gives rise to spores c. the gametophyte of the seedless vascular plants is free-living; the gametophyte of seed plants is not d. the sporophyte of seedless vascular plants is haploid; the sporophyte of the seed plants is diploid e. the gametophyte of the seed plants form spores; the gametophyte of the seedless vascular plants form gametes
Which of the following is TRUE about the
spores of seed plants?
a. megaspores develop into female gametophytes b. meiosis produces four megaspores c. microspores enlarge to become megaspores d. megaspores are diploid cells e. microspores undergo meiosis to form four pollen grains
Which of the following is NOT a form of
passive transport? a. osmosis b. facilitated diffusion c. simple diffusion d. exocytosis e. none of these