Timothy has been having difficulty breathing since he had pneumonia last month. Recently he had severe pain in his chest and back, and his breathing was extremely irregular. The doctor at the emergency room told him that one of the lobes of his lung had collapsed. How could this happen?
What will be an ideal response?
Timothy suffered atelectasis, or lung collapse, most likely caused by air entering the pleural cavity due to a rupture of the visceral pleura. The rupture could have happened as a result of coughing during his bout with pneumonia.
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More than one sperm is prevented from fertilizing an egg by all of the following mechanisms except:
A. Opening sodium channels in the plasma membrane causes a change in the electrical charge of the membrane. B. Secretion of material from cortical granules pushes sperm away from the already fertilized egg. C. A slow block to polyspermy occurs. D. A fast block to polyspermy occurs. E. Meiosis II is completed by the egg.
The shape of the lens is controlled by the
A) pupillary sphincter muscles. B) pupillary radial muscles. C) ciliary muscles. D) iris. E) cornea.
The arteries that are also called distributing arteries are the ________.
A) elastic arteries B) muscular arteries C) arterioles D) capillaries