The beating of the cilia of the respiratory passages in the direction of the pharynx forms the
A) respiratory mucosa.
B) lamina propria.
C) respiratory defense system.
D) mucus escalator.
E) conducting portion of the respiratory tract.
Answer: D
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The term "canines" describes the teeth that
A. bear dental cusps for cutting and grinding. B. are only found in dogs. C. are most anterior, used for slicing and cutting. D. are lateral to the incisors, used for puncturing and tearing. E. are only found as permanent teeth.
How can environmental conditions such as salt concentration, temperature, and pH physically affect the enzyme itself?
A) Ions can bind to the active sites of enzymes, preventing the binding of substrate. B) Changes in temperature change the rate at which molecules interact with the enzyme. C) All these factors can disrupt the weak bonds that hold the enzyme in its active conformation. D) These factors affect only the substrate.
The volume of air available for gas exchange per minute is called the ________.
A. vital capacity B. respiratory rate C. minute respiratory volume D. alveolar ventilation E. functional residual capacity
The average amount of hemoglobin in the blood of an adult female is
a) 5-10 g/dL of blood. b) 15-16 g/dL of blood. c) 20-25 g/dL of blood. d) 30-40 g/dL of blood. e) More than 50 g/dL of blood.