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Selected Answer:[None Given]Correct Answer:Both centers are not necessary for normal respiration. Only the inspiration center is involved in the normal respiratory process. The inspiration center sends impulses to the diaphragm and external intercostal muscles to generate contractions necessary for normal inhalation to occur. As the lungs inflate, baroreceptors(pressoreceptors) in lung tissue detect stretching and generate sensory impulses to the medulla which in turn depress the inspiration center(the Hering-Breur reflex). As decreased impulses come to the diaphragm and external intercostal muscles, they relax; the chest cavity compresses in on the lungs and normal exhalation occurs. The expiration center is only active when there is a need for more forceful exhalations, such as during exercise. The inspiration center activates the expirationcenter, whiih generates impulses to the internal intercostal and abdominal muscles causing them to contract. Contraction of these muscles forces the chest cavity to compress beyond that ofnormal exhalation, forcing more air out of the lungs. This allows CO2 to leave the body at the rate that it is produced preventing it from building up in the blood, decreasing blood pH, and causing respiratory acidosis.
Response Feedback:[None Given]Question 114 out of 4 pointsMatch each change in blood gas level with the proper descriptive statements.QuestionCorrect MatchSelected MatchDetected by chemoreceptors in the carotid and aortic bodiesA. Decreased blood O2A. Decreased blood O2The stimulus to increase respirations to inhale more oxygenA. Decreased blood O2A. Decreased blood O2Detected by chemoreceptors in the medullaB. Increased blood CO2B. Increased blood CO2The stimulus to inrease respirations to exhale more carbon dioxide.B. Increased blood CO2B. Increased blood CO2Question 126 out of 6 pointsMatch each respiratory pH imbalance with proper cause and effects.QuestionCorrect MatchSelected MatchCaused by a decrease in the rate or efficiency of respirationB. Respiratory acidosisB. Respiratory acidosisFewer H+ ions are formedA. Respiratory alkalosisA. Respiratory alkalosisCO2 accumulates in the bodyB. Respiratory acidosisB. Respiratory acidosisCO2 is exhaled more rapidlyA. Respiratory alkalosisA. Respiratory alkalosisCaused by an increase in the rate of respirationA. Respiratory alkalosisA. Respiratory alkalosis
More H+ ions are formedB. Respiratory acidosisB. Respiratory acidosisQuestion 13Needs GradingAs recently as 45 years ago (the early 1960s), it was believed that mouth-to-mouth resuscitation was not really helpful to another person. What mistaken belief about the air we exhale contributed to that thinking, and what are the facts?Selected Answer:It was believed unhelpful because we exhale carbon dioxide, which is harmful when inhaled in large amount, but we exhale about 16% oxygen and 4.5% carbon dioxide.