The actual sites of gas exchange within the lungs include
A) bronchioles.
B) alveolar ducts.
C) pleural spaces.
D) alveoli.
E) capillary beds.
D) alveoli.
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Which of the following is the correct order of small intestine regions that food passes through during digestion?
A. Ileum - duodenum - jejunum B. Ileum - jejunum - duodenum C. Jejunum - duodenum - ileum D. Duodenum - ileum - jejunum E. Duodenum - jejunum - ileum
The conjunctiva is a layer of tissue that lines the inner surface of the eyelids and covers
most of the anterior surface of the eye. Indicate whether the statement is true or false
Cross bridges
a. extend between the A and I bands and bend to pull the bands together during muscle contraction. b. are formed by the globular heads of the myosin molecules. c. link troponin and tropomyosin to actin to form the thin filament. d. extend from the thick filaments and bind to actin, then bend to pull the thin filaments in closer together during muscle contraction. e. two of these answers.
A graded response occurs when ________.
A. multiple muscles in a group are activated B. an individual muscle cell undergoes an all-or-none response C. multiple motor units are activated D. None of the choices are correct.