To be considered an organic molecule a substance must contain ________.
A. carbon and nitrogen
B. carbon and hydrogen
C. oxygen and hydrogen
D. carbon and oxygen
Answer: B
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One cause of hypoxic hypoxia in disease is diffusion impairment of O2 resulting from decreased alveolar surface area.
Answer the following statement true (T) or false (F)
When the ventricular walls contract,
A. the tricuspid valve opens and the mitral valve closes. B. the mitral and tricuspid valves open. C. the mitral valve opens and the tricuspid valve closes. D. the mitral and tricuspid valves close.
Together, the inflation and deflation reflexes are known as the ________ reflexes.
A) red herring B) Hering-Breuer C) Breuer-Shipley D) chemoreceptor E) vagal
Which of the following statements about the functions of the paranasal sinuses is false?
A) They provide an extensive area of mucous epithelium. B) They make skull bones lighter. C) The mucus they secrete enters the nasal cavities. D) They support cilia that move the mucus. E) They create a protected space for blood vessels and nerves.