In these views of the trachea, what type of tissue does number 3 indicate?
A. Trachealis muscle
B. Cricoid cartilage
C. Tracheal cartilage
D. Thyroid cartilage
E. Annular ligament
Answer: E
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What primarily determines airway resistance in the respiratory passageways?
A) degree of alveolar surface tension B) elasticity of the lung tissues C) diameter of the conducting zone passageways D) presence of surfactant
The product of the SRY gene is ___________.
A) 5-? reductase. B) anti-Müllerian hormone. C) testosterone. D) testis-determining factor. E) dihydrotestosterone.
All isotopes of a given element have the same atomic mass.
Indicate whether this statement is true or false.
Which muscle draws the eyebrows together when one frowns?
A. Orbicularis oculi B. Corrugator supercilii C. Nasalis D. Levator palpebrae superioris E. Frontal belly of the occipitofrontalis