What characteristic do simple diffusion and facilitated diffusion share?
A. Both require cellular energy for the transport of substances.
B. Both move a substance from a region of higher concentration to one of lower concentration without using cellular energy.
C. Both move water across a semipermeable membrane.
D. Both require a special carrier molecule to move substances across the membrane.
Answer: B
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Answer the following statement true (T) or false (F)
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You see a female patient in the emergency room with severe, intermittent "loin" (lumbar region) pain who is also having great difficulty urinating. Your most likely first diagnosis is:
A) kidney disease. B) ureteric ischemia. C) ruptured renal artery. D) ectopic pregnancy. E) ureteric calculus.
This structure prevents food from entering the airway.
a. Vestibular fold B. Uvula C. Laryngopharynx D. Epiglottis