Cary deliberately hyperventilates for several minutes before diving into a swimming pool. Shortly after he enters the water and begins swimming, he blacks out and almost drowns. What caused this to happen?
What will be an ideal response?
Hyperventilation causes a decrease in the alveolar PCO2, and more carbon dioxide is eliminated from the body than during normal breathing. The loss of large amounts of carbon dioxide upsets the body's normal drive for ventilation, and Cary does not feel the urge to breathe as he swims. As the exercising muscles use oxygen, a state of hypoxia develops. This results in insufficient amounts of oxygen reaching the brain, causing Cary to lose consciousness.
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What will be an ideal response?
The inner portion of the adrenal gland is the
A) follicle. B) lobe. C) medulla. D) cortex. E) infundibulum.
Which condition below might warrant a lumbar puncture for diagnosis?
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