Which structure is not considered to be part of the membranous labyrinth?
A. Cochlear duct
B. Utricle
C. Scala vestibuli
D. Semicircular duct
E. Saccule
Answer: C
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Which of the following selections correctly lists the sequence of events that occur during intramembranous ossification?
a) Ossification center develops > Calcification > Formation of trabeculae > Development of new periosteum. b) Calcification > Ossification center develops > Formation of trabeculae > Development of new periosteum. c) Ossification center develops > Formation of trabeculae > Calcification > Development of new periosteum. d) Development of new periosteum > Ossification center develops > Calcification > Formation of trabeculae. e) Ossification center develops > Calcification > Development of new periosteum > Formation of trabeculae.
Prostaglandins
a. are produced by most body tissues b. are derivatives of arachidonic acid c. act locally within or near their site of production d. promote sperm transport by stimulating smooth muscle contractions e. have all of the above characteristics
Airway resistance
a. is normally the primary factor determining the amount of flow into/out of the lungs. b. is increased when the diameter of the airways becomes reduced. c. when elevated requires an increased pressure gradient between the lungs and atmosphere through vigorous respiratory efforts to move even normal volumes of air into and out of the lungs. d. both (b) and (c) above. e. all of these answers.
Which type of lung cancer is the least common form of lung cancer, but it is the most deadly because it easily metastasizes to other tissues?
A. Oat cell carcinoma B. Squamous cell carcinoma C. Adenocarcinoma D. None of these are correct.