In a person who does NOT have cystic
fibrosis, what is the related normal condition?
a. mucus slides easily over epithelial surfaces
and can more easily be expelled
b. osmotic balance in tissues is maintained by
pumping sodium out of cells and chloride
into cells
c. pH balances are maintained by pH buffers,
mainly the bicarbonate ion
d. muscle fibers contract in coordination
allowing smooth whole muscle contractions
e. plasma membranes function properly to
allow nonpolar molecules to diffuse into
and out of the cells
A
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Gymnosperms are the most ecologically diverse plants on Earth
a. True b. False
Owls have many anatomical modifications that enable them to hunt at night. For example, some of their feathers are serrated on the edges, which eliminate the noise created by air flowing over a smooth feather surface
Owls can thus descend on their prey without a sound. They can locate small prey with remarkable accuracy, even in dim light or complete darkness. Experiments conducted in totally dark, soundproof rooms have shown that owls can capture prey after pinpointing its location to within 1.5 degrees in both horizontal and vertical planes. Based on this scenario, which of these structures do owls primarily rely on when they hunt in total darkness? A) Olfactory bulb B) Umami receptors C) Mechanoreceptors D) Photoreceptors E) Nociceptors
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Figure 36.2B
Circulation in the accompanying diagram functions primarily as a(n) ____.
A. an open circulatory system B. system consisting of mostly of tissue spaces C. closed circulatory system D. interstitial fluid system E. three-directional system
During gas exchange, body cells
A) take up CO2 and release O2. B) release O2 to red blood cells. C) increase in size to accommodate the reuptake of O2. D) release CO2 and take up O2.