People who work in factories that package buttered popcorn can develop a disorder
caused by inhaling organic dust. This disorder is called
A) extrinsic allergic alveolitis. B) asbestosis.
C) emphysema D) berylliosis
A
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Which of the following anchors the conceptus to the uterine wall?
A. Cytotrophoblast B. Syncytiotrophoblast C. Embryoblast D. Blastomere E. Yolk sac
The diaphragm receives help from the ________ muscles in the activity of breathing.
A. pleural B. thoracic C. accessory D. respiratory
Which of the following statements is true?
a. Tonicity refers to the effect of penetrating solutes on cell volume. b. A one molal solution contains 1 mole of solute per liter of solution. c. To accommodate larger molecules, membrane channels have an average diameter of 1 – 1.5 nanometers. d. Carrier proteins span the membrane and can undergo shape changes. e. Aquaporins regulate solute movement across membranes.
Which part of a neuron will have the highest density of voltage-gated Na+ channels?
a. the dendrites b. the cell body c. the axon hillock d. the axon e. the axon terminal.