An alveolar sac is made of
A. pseudostratified ciliated columnar epithelium.
B. smooth muscle and hyaline cartilage.
C. simple squamous epithelium.
D. stratified squamous epithelium.
Answer: C
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Chromosomes are composed mainly of DNA.
Answer the following statement true (T) or false (F)
Which element commonly has only a proton as its nucleus?
A) helium B) neon C) argon D) hydrogen E) carbon
The diaphragm divides the:
a. dorsal from the ventral cavity b. abdominal from the pelvic cavity c. thoracic from the abdominal cavity d. pleural from the mediastinum
which describes the action of the diaphragm when it contracts?
a) during expiration, it depresses and retracts the ribs b) during expiration, it elevates the floor of thorax c) during inspiration, it depresses the floor of thorax d) during inspiration, it elevates and protracts the ribs