In which disorder is the elastic tissue of the lung destroyed making expiration extremely difficult?
a. emphysema
b. asthma
c. lung cancer
d. bronchitis
e. apnea
ANSWER: a
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A normal human urinary system consists of ____
a. two urethras b. two ureters c. two bladders d. one kidney e. one cloaca
The structures labeled "B" in the accompanying figure ____
a. prevent movement of materials between cells b. are found in tissues subjected to stretching c. allow the free passage of materials between cells d. are found mostly in heart muscle e. are found in most tissues except in the stomach
Tracers are elements that ____.
A. are used in minute amounts in plants B. can be monitored during biochemical reactions C. must be inert D. have an unbalanced electrical charge E. must have a stable nucleus
Figure 29.12 C
Use the accompanying figure of a Capsella seed to answer the following question.
?
A cotyledon is indicated by the letter ____.
A. A B. B C. C D. D E. E