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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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 function of red blood cells is to
A) carry oxygen from the cells to the lungs. B) carry carbon dioxide from the lungs to the body's cells. C) carry nutrients from the digestive system to the body's cells. D) defend the body against infectious organisms. E) carry oxygen to the cells and then carry away carbon dioxide.
The arteries that are also called distributing arteries are the ________.
A) elastic arteries B) muscular arteries C) arterioles D) capillaries